Usually means: Verb indicating existence, identity, equivalence.
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We found 65 dictionaries that define the word is:

General (32 matching dictionaries)
  1. IS, I's, Is, i's, is, is-: Merriam-Webster.com
  2. IS, I's, Is, Is, is: Oxford Learner's Dictionaries
  3. Is, is, is-: American Heritage Dictionary of the English Language
  4. I's, Is, is, is-: Collins English Dictionary
  5. is: Vocabulary.com
  6. I.S, IS, I's, I.'s, Is, Is, Is, i's, is, is, is, is, is, is, is, is-, iS, i'S: Wordnik
  7. i's, is: Cambridge Advanced Learner's Dictionary
  8. I's, Is, 'is, i's, is, is-: Wiktionary
  9. is, is-: Webster's New World College Dictionary, 4th Ed.
  10. Is, is: The Wordsmyth English Dictionary-Thesaurus
  11. is: Infoplease Dictionary
  12. Is-, Is, .is, i's, is, is-: Dictionary.com
  13. is: Online Etymology Dictionary
  14. is: Cambridge Essential American English Dictionary
  15. IS (Infinite Stratos), IS (disambiguation), IS, Is (album), Is (novel), Is (rune), Is, Is, .is: Wikipedia, the Free Encyclopedia
  16. Is-, Is: Online Plain Text English Dictionary
  17. is, is-: Webster's Revised Unabridged, 1913 Edition
  18. Is-, Is: AllWords.com Multi-Lingual Dictionary
  19. is: Webster's 1828 Dictionary
  20. is, is-: MyWord.info
  21. IS, Is, .is: Stammtisch Beau Fleuve Acronyms
  22. is, is-: Free Dictionary
  23. is: LookWAYup Translating Dictionary/Thesaurus
  24. Is, i's, is, is-: Dictionary/thesaurus
  25. is: Wikimedia Commons US English Pronunciations
  26. Is: Wordnik

Art (4 matching dictionaries)
  1. The Organon: A Conceptually Indexed Dictionary (by Genus and Differentia) (No longer online)
  2. is-: A Cross Reference of Latin and Greek Elements
  3. Glossary of Stamp Collecting Terms (No longer online)
  4. ODLIS: Online Dictionary of Library and Information Science (No longer online)

Business (7 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. Travel Industry Dictionary (No longer online)
  3. IS: Bloomberg Financial Glossary
  4. is: Legal dictionary
  5. IS, i's: Financial dictionary
  6. Glossary of Trade and Shipping Terms (No longer online)
  7. Alphabetical catalogue of companies. (No longer online)

Computing (6 matching dictionaries)
  1. IS, is: Free On-line Dictionary of Computing
  2. IS: Netlingo
  3. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  4. IS: Computer Telephony & Electronics Dictionary and Glossary
  5. Webopedia (No longer online)
  6. IS, i's: Encyclopedia

Medicine (3 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. Hepatitis C Information Central (No longer online)
  3. i's, is, is(o)-, is-: Medical dictionary

Miscellaneous (4 matching dictionaries)
  1. Navajo Code Talkers' Dictionary (No longer online)
  2. IS(OGTT), IS: Acronym Finder
  3. AbbreviationZ (No longer online)
  4. United States Postal Service Official Abbreviations (No longer online)

Science (4 matching dictionaries)
  1. is: Dictionary of Botanical Epithets
  2. Misunderstood Physics Terms (No longer online)
  3. is: MATH SPOKEN HERE!
  4. is: A Dictionary of Quaternary Acronyms and Abbreviations

Slang (1 matching dictionary)
  1. I.S, I.S, I's: Urban Dictionary

Tech (4 matching dictionaries)
  1. is: Webster's New World Telecom Dictionary
  2. I.S, IS, Is: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  3. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)
  4. PhotoNotes Dictionary of Film and Digital Photography (No longer online)

(Note: See be as well.)

Google, News, Wikipedia, Reddit, X, BlueSky, Kagi
Definitions from Wiktionary (
)
American English Definition British English Definition
▸ verb:  (now colloquial) Used in phrases with existential there (also here and where) when the semantic subject is plural.
▸ noun:  (rare) Alternative form of i's.
▸ noun:  Initialism of Islamic State. [A Salafist group active in Libya, Nigeria, Iraq and Syria, where it has proclaimed an (unrecognized) state.]
▸ noun:  (languages) Initialism of Interior Salish.
▸ noun:  Initialism of International Sign.
▸ noun:  (computing) Initialism of information system(s).
▸ noun:  (politics) Initialism of international studies. [Synonym of international relations, commonly abbreviated as IS.]
▸ noun:  (finance) Initialism of implementation shortfall.
▸ noun:  Abbreviation of Islands. (also Is.) [A district of Hong Kong.]

Similar:
anybody who is anybody, anyone who is anyone, as it is, everyone who is anybody, fact is, how the wind is blowing, know what is what, know which way is up, like there is no tomorrow, not as black as one is painted, more...

Opposite:
isn't, isn't, isn't, isn't, isn't

Types:
are, were, be, being, been, more...

Phrases:
that is, what is, is used, is it, is at, more...


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Similar:
anybody who is anybody, anyone who is anyone, as it is, everyone who is anybody, fact is, how the wind is blowing, know what is what, know which way is up, like there is no tomorrow, not as black as one is painted, more...

Opposite:
isn't, isn't, isn't, isn't, isn't

Types:
are, were, be, being, been, more...

Phrases:
that is, what is, is used, is it, is at, here is, is on, is about, is for, is well, is going, life is, Time Is, is done, is concerned, is taken, is associated, is even, thing is, is reduced, more...



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