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  • Unity definition, the state of being one; oneness.
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a. The state or quality of being one or united into a whole: 'The Founding Fathers had abhorred the concept of parties, fearing that they would undermine the unity of the nation through factionalism'(Julian E. Zelizer).
b. The state or quality of being in accord; harmony: The judges ruled in unity on the matter.
c. The state or quality of being unified in an aesthetic whole, as in a work of literature: the novel's thematic unity.
d. A whole that is a combination of parts: a group of ideas that taken together constitute a unity.
2. Singleness or constancy of purpose or action; continuity: 'In an army you need unity of purpose'(Emmeline Pankhurst).
3. One of the three principles of dramatic structure derived by French neoclassicists from Aristotle's Poetics, stating that a drama should have but one plot, which should take place in a single day and be confined to a single locale.
4. Mathematics
b. See identity element.
[Middle English unite, from Old French, from Latin ūnitās, from ūnus, one; see oi-no- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈjuːnɪtɪ) n, pl-ties
2. the act, state, or quality of forming a whole from separate parts
3. something whole or complete that is composed of separate parts
4. mutual agreement; harmony or concord: the participants were no longer in unity.
6. (Mathematics) maths
b. a quantity assuming the value of one: the area of the triangle was regarded as unity.
c. the element of a set producing no change in a number following multiplication
7. (Art Terms) the arrangement of the elements in a work of art in accordance with a single overall design or purpose
8. (Theatre) any one of the three principles of dramatic structure deriving from Aristotle's Poetics by which the action of a play should be limited to a single plot (unity of action), a single location (unity of place), and the events of a single day (unity of time)
[C13: from Old French unité, from Latin ūnitās, from ūnus one]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈyu nɪ ti)
n., pl. -ties.
2. a whole or totality as combining all its parts into one.
3. the state or fact of being united or combined into one, as of the parts of a whole; unification.
4. absence of diversity; unvaried or uniform character.
5. oneness of mind, feeling, etc., as among a number of persons; concord, harmony, or agreement.
6. Math. the number one; a quantity regarded as one.
7. (in literature and art) harmony among the parts or elements of a work producing a single major effect.
8. one of the three principles of dramatic structure (the three unities) derived from Aristotelian aesthetics by which a play is limited in action to one day (u′nity of time′) and one place (u′nity of place′) and to a single plot (u′nity of ac′tion).
[1250–1300; Middle English unite < Old French < Latin ūnitās, derivative of ūnus one]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Noun1.unity - an undivided or unbroken completeness or totality with nothing wanting; 'the integrity of the nervous system is required for normal development'; 'he took measures to insure the territorial unity of Croatia'
integrity, wholeness
state - the way something is with respect to its main attributes; 'the current state of knowledge'; 'his state of health'; 'in a weak financial state'
completeness - the state of being complete and entire; having everything that is needed
incompleteness, rawness - the state of being crude and incomplete and imperfect; 'the study was criticized for incompleteness of data but it stimulated further research'; 'the rawness of his diary made it unpublishable'
2.unity - the smallest whole number or a numeral representing this number; 'he has the one but will need a two and three to go with it'; 'they had lunch at one'
digit, figure - one of the elements that collectively form a system of numeration; '0 and 1 are digits'
monas, monad - a singular metaphysical entity from which material properties are said to derive
singleton - a single object (as distinguished from a pair)
3.unity - the quality of being united into one
identicalness, indistinguishability, identity - exact sameness; 'they shared an identity of interests'
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


1.union, unification, coalition, federation, integration, confederation, amalgamationthe future of European economic unity
2.wholeness, integrity, oneness, union, unification, entity, singleness, undividednessThe deer represents the unity of the universe.
wholenessdivision, separation, disunity, multiplicity, heterogeneity
3.agreement, accord, consensus, peace, harmony, solidarity, unison, assent, unanimity, concord, concurrenceSpeakers at the rally mouthed sentiments of unity.
agreementdivision, disagreement, discord, independence, strife, in-fighting, individuality, disunity, ill will, factionalism
'We must indeed all hang together, or, most assuredly, we shall all hang separately' [Benjamin Franklin on his signing of the Declaration of Independence]
'All for one; one for all' [Alexandre Dumas The Three Musketeers]
'By uniting we stand, by dividing we fall' [John Dickinson The Patriot's Appeal]
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002


1. The condition of being one:
2. Harmonious mutual understanding:
accord, agreement, concord, concordance, concurrence, consonance, harmony, rapport, tune.
3. A bringing together into a whole:
4. The result of combining:
combination, composite, compound, conjugation, unification, union.
5. An identity or coincidence of interests, purposes, or sympathies among the members of a group:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
einingeining, heildarsvipursamstaîa, samheldni
vienovėvientisas dalykasvienybė


[ˈjuːnɪtɪ]N (= oneness) → unidadf; (= harmony) → armoníaf, acuerdom
unity of placeunidadf de lugar
unity of timeunidadf de tiempo
unity is strengthUnityla uniónhace la fuerza
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


(= union) → unitéf
European economic unity → l'unité économiqueeuropéenne
(= being in agreement) → unitéf
There is a need for greater unity in the party → Une plus grandeunitéestnécessaire au sein du parti.
Collins English/French Electronic Resource. © HarperCollins Publishers 2005


(= oneness, Liter) → Einheitf; (= harmony)Einmütigkeitf, → Einigkeitf; (of a novel, painting etc)Einheitlichkeitf, → Geschlossenheitf; national unity(nationale) Einheit; this unity of purposediese gemeinsamenZiele; to live in unityin Eintrachtleben; unity is strength → (Prov)
(Math) → Einheitf; (= one)Einsf; (in set theory) →
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


[ˈjuːnɪtɪ]n (in party, country) → unità; (of members, individuals) → unionef
in unity → in armonia, in pienoaccordo
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995


(ˈjuːnəti) plural ˈunities noun
1. the state of being united or in agreement. When will men learn to live in unity with each other? eenparigheid, eenheid وَحْدَه، إتِّفاق единство harmonia shoda die Eintracht enighed; harmoni ενότητα, ομόνοιαunidad üksmeel سازگاری؛ همبستگی yksimielisyys unitéאחדות एकता jedinstvo egyetértés kerukunan samstaða, samheldni unità 一致 일치, 화합 vienybė, vieningumas, sutarimas vienotība; saderība perpaduan eenheidenhet, enighetzgoda, harmonia unidade unitate согласие zhoda sloga jedinstvo endräkt ความสามัคคี birlik, bütünlük 統一,和睦 єдність; єднання اتحاد sự thống nhất 统一
2. singleness, or the state of being one complete whole. Unity of design in his pictures is this artist's main aim. eenvormigheid وَحْدَه، اكْتِمال хармония uniformidade jednotnost die Einheitlichkeit harmoni η ιδιότητα του ενιαίου, η κατάσταση του να είναι κτ. ενιαίο σύνολο unidad ühtsus وحدت yhtenäisyys unitéאחדות एका jedinstvenost egység(esség) kesatuan eining, heildarsvipur unità 統一性 하나임 vienovė, vieningumas vienotība perpaduan eenheidhelhet jedolitość unidade unitate единство jednotnosť enotnost jedinstvo enhet ความเป็นเอกภาพ birlik 一致(性) єдність ندرت، وحدت tính đơn nhất 一致(性)
3. something arranged to form a single complete whole. This play is not a unity, but a series of unconnected scenes. eenheid وَحْدَةٌ كامِلَه едно união jednota die Einheit enhed ενότητα, ενιαίο σύνολο unidad tervik ساختار واحد kokonaisuus unitéאחדות इकाई cjelina egység kesatuan eining unità 統一体 (여러 요소에 의한) 전체 구성 vienovė, vientisas dalykas vienots veselums perpaduan eenheidenhetjedność, całość unidade unitate единое целое jednota enota celina [sammanhållen] helhet ความพร้อมเพรียงกัน bütün 整體 єдність مستقل بالذات sự thống nhất 整体
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.


English-Spanish Medical Dictionary © Farlex 2012

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The fastest path to building a HoloLens mixed reality app in Unity is with the Mixed Reality Toolkit. If you're brand new to Unity, we recommend that you explore the beginner level tutorials on the Unity Learn platform before continuing. It's also a good idea to visit the comprehensive Asset Store and the Unity Mixed Reality forums to engage with the online community building mixed reality apps. You never know what cool assets or solutions you might find out in the wild. When you're ready to get started with MRTK head to the development checkpoints below!


Take a look at our porting guides if you have an existing Unity project that you want to bring over to HoloLens 2. We have guides for projects that are using HTK, MRTK v1, or SteamVR.

Development checkpoints

Use the following checkpoints to bring your Unity games and applications into the world of mixed reality. If you haven't already explored the Designing Holograms sample application, we recommend downloading and using it to familiarize yourself with the basics of Mixed Reality UX.

1. Getting started

The easiest way to develop in Unity is with the Mixed Reality Toolkit. MRTK will help you automatically setup a project for Mixed Reality and provide a set of features to accelerate your development process. By the end of this section, you'll have a basic understanding of the Mixed Reality Toolkit, a properly configured development environment for Mixed Reality apps, and a working MRTK project in Unity that you built yourself.

Introducing the Mixed Reality ToolkitBegin your journey by getting acquainted with the Mixed Reality Toolkit and what it has to offer
Download the Mixed Reality Feature ToolA new developer tool for discovering, updating, and adding Mixed Reality feature packages to your Unity projects
Setup your developer environmentDownload and install the latest Unity package and setup your project for mixed reality
Complete the HoloLens 2 tutorial seriesDive into beginner level MRTK tutorials for HoloLens 2 hardware


If you'd like to create a new Unity project without importing Mixed Reality Toolkit, there are a small set of Unity settings you'll need to manually change for Windows Mixed Reality. Take a look at our configuration guide for more information.



Once you've setup MRTK in your project, standard Unity game objects like the camera will light up immediately for a seated-scale experience. You can find instructions on changing the experience scale of your application on the coordinate systems page.

2. Core building blocks

All of the core building blocks for mixed reality applications are exposed in a manner consistent with other Unity APIs. These building blocks are available as standalone features and through the Mixed Reality Toolkit. You might not need all of them at once, but we recommend exploring early on. After diving into the core building blocks listed below, you'll have a toolbox full of features you can integrate into a Mixed Reality project by themselves or through MRTK.

CameraFully optimize visual quality and hologram stability in your Mixed Reality apps
World locking and spatial anchorsSolve stabilization issues, camera adjustment, and integrate a stable coordinate system solution
Shared experiencesView and interact collectively with the same hologram at a fixed point in space using spatial anchor sharing
GazeLet users target holograms with by looking at them
Motion controllersAdd spatial actions to your Mixed Reality apps
GesturesUse hand gestures as input in your Mixed Reality experiences
Hand and eye trackingIntegrate articulated hand and eye tracking input into your user experience
Spatial mappingMap your physical space with a virtual mesh overlay to mark the boundaries of your environment
Spatial soundEnhance your apps with immersive 3D audio
TextGet sharp, high-quality text that has a manageable size and quality rendering
Voice inputCapture spoken keywords, phrases, and dictation from your users

3. Advanced features

Other key features that play a role in mixed reality applications are available through Unity APIs without any extra packages or setup. These features can be added to Unity projects with or without MRTK installed. After diving into the more advanced capabilities that Unity offers, you'll be able to build deeper, complex Mixed Reality apps.

Photo video cameraCapture photos and video content in your Mixed Reality application
Focus pointProvide HoloLens a hint about how to best perform stabilization on the holograms currently being displayed
Tracking lossHandle scenarios where your device can't locate itself in the applications world space
Keyboard inputGet input from real-world and Mixed Reality keyboards in your apps

4. Deploying to a device or emulator

Once you've got your holographic Unity project ready for testing, your next step is to export and build a Unity Visual Studio solution. With that VS solution in hand, you can run your application in one of three ways on a real or simulated device. By the end of this section, you'll be able to deploy your application on whichever device or emulator fits your development needs.

5. Adding services

At this point in your development journey you might be looking to add services or for a helping hand with commercial deployment. Integrating Azure Cloud Services and Dynamics 365 features can level up your projects in a major way. We've compiled a few starting points for you to explore and expand your Mixed Reality knowledge.

Azure Remote Rendering (ARR) is a service that lets you to render highly complex 3D models in real time. ARR is currently in public preview. It can be added to your Unity or Native C++ projects targeting HoloLens 2 or Windows desktop PC.

Azure Spatial Anchors (ASA) is a cross-platform service that allows you to build spatially aware mixed reality applications. With Azure Spatial Anchors, you can map, persist, and share holographic content across multiple devices, at real-world scale.

Microsoft Dynamics 365 Guides is a mixed-reality application for Microsoft HoloLens that lets operators learn during the flow of work by providing holographic instructions when and where they are needed. These instruction cards are visually tethered to the place where the work must be done, and can include images, videos, and 3D holographic models.

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We also have a comprehensive list of support documentation for additional Azure services that you can add to your Unity projects on a self-serve basis. Digital kitchen timer.

What's next?

A developers job is never done, especially when learning a new tool or SDK. The following sections can take you into areas beyond the beginner level material you've already completed, along with helpful resources if you get stuck. Note that these topics and resources aren't in any sequential order, so feel free to jump around and explore!


If you have existing apps that you'd like to port over, the articles listed below are your next stop:


If you're looking to add specific Mixed Reality features to your applications, we have several curated tutorials that can run you through the process from end-to-end. Our most popular HoloLens 2 and HoloLens (1st Gen) content is listed below, but you can find the entire collection by visiting the tutorials overview.

Additional resources

Before going out into the world of mixed reality on your own, we recommend taking a look at the MRTK-related documentation listed below. These articles are great jumping off points for understanding how MRTK works in greater detail and will give you insight into making your app more performant.

MRTK Architecture overviewGet a deeper understanding of how the MRTK SDK works in your projects
Settings and performanceProfile your app, update your Unity settings, and get the best hologram stabilization performance available
Getting started with MRTK + XRTransfer over to the alternative XR pipeline provided by Unity

Unity resources

In addition to this documentation available on docs.microsoft.com, Unity installs documentation for Windows Mixed Reality functionality alongside the Unity Editor. The Unity provided documentation includes two separate sections.

Scripting referenceThis section of the documentation contains details of the scripting API that Unity provides and is accessible online from the Unity Editor by clicking Help > Scripting Reference
ManualThis manual is designed to help you learn how to use Unity, from basic to advanced techniques, and is accessible online or from the Unity Editor by clicking Help > Manual

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Have feedback?

You can find us on the Unity Forums by tagging Microsoft and a combination of the following tags to help us understand what plugin you're providing feedback for:

  • HoloLens 2
  • Windows Mixed Reality
  • OpenXR
  • Legacy XR

See also