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The meaning of OR is —used as a function word to indicate an alternative, the equivalent or substitutive character of two words or phrases, or approximation ...
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Learn to pronounce or

/ôr/
conjunction
  1. used to link alternatives.
    "a cup of tea or coffee"
  2. introducing a synonym or explanation of a preceding word or phrase.
    "the espionage novel, or, as it is known in the trade, the thriller"
  3. otherwise (used to introduce the consequences of something not being done or not being the case).
    "hurry up, or you'll miss it all"
  4. introducing an afterthought, usually in the form of a question.
    "John's indifference—or was it?—left her unsettled"
  5. either.
    "to love is the one way to know or God or man"

noun
a Boolean operator that gives the value one if at least one operand (or input) has a value of one, and otherwise has a value of zero.

Or is a conjunction that connects two or more possibilities or alternatives. It connects words, phrases and clauses which are the same grammatical type: …
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Or definition: (used to connect words, phrases, or clauses representing alternatives). See examples of OR used in a sentence.
OR · noun. a room in a hospital equipped for the performance of surgical operations. synonyms: operating room, operating theater, operating theatre, surgery.
Other uses · Or (name), Hebrew given name and surname · Official Records of the American Civil War · Olympic record, a term for the best performances in Olympic ...
From late Middle English or (“gold”), borrowed from Middle French or (“yellow”), from Old French or, from Latin aurum (“gold”). Doublet of aurum.
OR in American English 2 · 1. Law. on (one's own) recognizance · 2. operating room · 3. operations research · 4. Oregon (approved esp. for use with zip code).
Suffix appended to words to create a masculine noun, usually denoting a profession or a performer, used chiefly for words of Latin origin.