Usually means: Augmented reality, interactive digital overlay.
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We found 58 dictionaries that define the word ar:

General (23 matching dictionaries)
  1. AR, AR, Ar, -ar, ar: Merriam-Webster
  2. AR, Ar, Ar, -ar, -ar, -ar, -ar, ar-: Oxford Learner's Dictionaries
  3. AR, Ar, Ar, ar, ar: American Heritage Dictionary of the English Language
  4. Ar, -ar, a.r, ar: Collins English Dictionary
  5. AR, Ar, ar: Vocabulary.com
  6. A.R, AR, AR, A'r, Ar, Ar, a'r, ar, ar, ar, ar, aR: Wordnik
  7. A.R, -ar, ar, ar-: Wiktionary
  8. -ar, ar, ar-: Webster's New World College Dictionary, 4th Ed.
  9. AR (Ark.), Ar, -ar: The Wordsmyth English Dictionary-Thesaurus
  10. ar-: Infoplease Dictionary
  11. AR(1), -ar, .ar, a.r, ar, ar, ar-: Dictionary.com
  12. .AR, AR(1), AR (disambiguation), AR (gene), AR, Ar-, Ar (Unix), Ar (city), Ar (file format), Ar, .ar: Wikipedia, the Free Encyclopedia
  13. Ar: Online Plain Text English Dictionary
  14. ar: Webster's Revised Unabridged, 1913 Edition
  15. ar: Rhymezone
  16. Ar: AllWords.com Multi-Lingual Dictionary
  17. AR, AR, Ar, Ar, .ar, ar: Stammtisch Beau Fleuve Acronyms
  18. ar: FreeDictionary.org
  19. ar: Mnemonic Dictionary
  20. Ar, Ar: TheFreeDictionary.com
  21. ar: Longman Dictionary of Contemporary English

Art (4 matching dictionaries)
  1. AD&D Dwarven Dictionary (No longer online)
  2. AR: Numismatic Dictionary
  3. -ar: A Cross Reference of Latin and Greek Elements
  4. Glossary of Stamp Collecting Terms (No longer online)

Business (8 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. AR(1), AR: Glossary of research economics
  3. Construction Term Glossary (No longer online)
  4. AR: Investopedia
  5. AR: Legal dictionary
  6. AR: Financial dictionary
  7. Glossary of Trade and Shipping Terms (No longer online)
  8. AR: Accounting Glossary

Computing (4 matching dictionaries)
  1. ar: Free On-line Dictionary of Computing
  2. Webopedia (No longer online)
  3. Ar: Encyclopedia
  4. AR: Game Dictionary

Medicine (5 matching dictionaries)
  1. Ar: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. Ar, -ar: Medical dictionary
  5. PERFUSION TECHNOLOGY, OPEN HEART SURGERY AND CARDIOLOGY (No longer online)

Miscellaneous (3 matching dictionaries)
  1. AR(1), AR: Acronym Finder
  2. AbbreviationZ (No longer online)
  3. United States Postal Service Official Abbreviations (No longer online)

Religion (1 matching dictionary)
  1. Ar: Smith's Bible Dictionary

Science (4 matching dictionaries)
  1. AR: Cytokines & Cells Online Pathfinder Encyclopaedia
  2. AR: PlanetMath Encyclopedia
  3. AR, Ar, ar: A Dictionary of Quaternary Acronyms and Abbreviations
  4. Ar: WebElements Periodic Table of the Elements

Slang (2 matching dictionaries)
  1. Totally Unofficial Rap (No longer online)
  2. A.R, A.R, AR, Ar: Urban Dictionary

Tech (4 matching dictionaries)
  1. AR: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  3. Rane Professional Audio Reference (No longer online)
  4. SOLAR-TERRESTRIAL TERMS (No longer online)

(Note: See aring as well.)

Definitions from Wiktionary (Ar)

noun:  (countable, weaponry) An AR-15 personal semi-automatic rifle, M-16 assault rifle, M-4 carbine, derivative or related gun; the Armalite AR family and derivatives.
noun:  (countable, weaponry, informal) An assault rifle or automatic rifle.
noun:  Postal abbreviation of Arkansas
noun:  The name of the Latin-script letter R/r.
adjective:  (statistics) Initialism of autoregressive. [(statistics) Employing autoregression, using a weighted sample of past data to predict future results]
noun:  (uncountable or plural only, accounting) Initialism of accounts receivable. [(accounting) The total monetary amount owed to a financial entity due to debts arising from sales on credit or on account.]
noun:  (philately, post) Initialism of acknowledgment of receipt.
noun:  (pornography) Initialism of age regression. [Mental reversion to a younger age, used in therapy, as a coping mechanism, or as a manifestation of a psychiatric issue.]
noun:  (fandom slang) Initialism of alternate reality.
noun:  (countable, sports, US) Initialism of American record, national record for the United States.
noun:  Initialism of administrative rule and administrative regulation.
noun:  (biochemistry) Initialism of androgen receptor.
noun:  (sports, countable) Initialism of area record, best achievement among those by persons from a given continent.
noun:  (crime) Initialism of armed robbery. [(law) A theft where the thieves are armed with weapons.]
noun:  (emergency medicine) Initialism of artificial respiration. [(medicine) The manual or mechanical forcing of air into the lungs of a person who is not breathing in order to maintain life.]
noun:  (countable) Initialism of aspect ratio. [The ratio of an object's longest dimension to its next-longest dimension.]
noun:  (law, politics) Initialism of assembly resolution.
noun:  (meteorology) Initialism of atmospheric river. [(meteorology) A narrow and long band of atmospheric moisture that transports a lot of water vapour, originating from the tropics, in a manner superficially similar to how a terrestrial river transports water.]
noun:  (uncountable, computing) Initialism of augmented reality. [(computing) The merging of a view of the real-world environment upon a digital image in real time.]
noun:  Abbreviation of Arunachal Pradesh, a state of India [A state in northeastern India. Capital: Itanagar.]
verb:  Obsolete spelling of are.
noun:  Alternative letter-case form of ar [The name of the Latin-script letter R/r.]

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