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[in-fin-i-tee] /ɪnˈfɪn ɪ ti/
noun, plural infinities.
the quality or state of being infinite.
something that is infinite.
infinite space, time, or quantity.
an infinite extent, amount, or number.
an indefinitely great amount or number.
  1. the assumed limit of a sequence, series, etc., that increases without bound.
  2. infinite distance or an infinitely distant part of space.
  1. a distance between a subject and the camera so great that rays of light reflected from the subject may be regarded as parallel.
  2. a distance setting of the camera lens beyond which everything is in focus.
Origin of infinity
1350-1400; Middle English infinite < Latin infīnitās, equivalent to in- in-3 + fīni(s) boundary (see finish) + -tās -ty2
Can be confused
affinity, infinity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for infinity
Contemporary Examples
Historical Examples
  • It possesses the attributes of infinity, is indestructible, immortal, undying.

    Ghosts I Have Seen Violet Tweedale
  • "There is no end to the study of infinity," was Mrs. Hayden's reply.

    The Right Knock Helen Van-Anderson
  • Well, Mr. Hugo, I have had an infinity of trouble with that girl.'

    Hugo Arnold Bennett
  • They are associated with an infinity of qualifiers, names, and phrases.

  • infinity reaches to the infinitely little as readily as to the infinitely great.

British Dictionary definitions for infinity


noun (pl) -ties
the state or quality of being infinite
endless time, space, or quantity
an infinitely or indefinitely great number or amount
(optics, photog) a point that is far enough away from a lens, mirror, etc, for the light emitted by it to fall in parallel rays on the surface of the lens, etc
(physics) a dimension or quantity of sufficient size to be unaffected by finite variations
(maths) the concept of a value greater than any finite numerical value
a distant ideal point at which two parallel lines are assumed to meet
Symbol (for senses 4–7)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for infinity

late 14c., from Old French infinité "infinity; large number or quantity" (13c.), from Latin infinitatem (nominative infinitas) "boundlessness, endlessness," from infinitus boundless, unlimited" (see infinite). Infinitas was used as a loan-translation of Greek apeiria "infinity," from apeiros "endless."

Online Etymology Dictionary, © 2010 Douglas Harper
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infinity in Science
A space, extent of time, or quantity that has no limit.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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infinity in Technology

1. The size of something infinite.
Using the word in the context of sets is sloppy, since different infinite sets aren't necessarily the same size cardinality as each other.
See also aleph 0
2. The largest value that can be represented in a particular type of variable (register, memory location, data type, whatever).
See also minus infinity.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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