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.
the assumed limit of a sequence, series, etc., that increases without bound.
infinite distance or an infinitely distant part of space.
a distance between a subject and the camera so great that rays of light reflected from the subject may be regarded as parallel.
a distance setting of the camera lens beyond which everything is in focus.

1350–1400; Middle English infinite < Latin infīnitās, equivalent to in- in-3 + fīni(s) boundary (see finish) + -tās -ty2

affinity, infinity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
infinity (ɪnˈfɪnɪtɪ)
n , pl -ties
1.  the state or quality of being infinite
2.  endless time, space, or quantity
3.  an infinitely or indefinitely great number or amount
4.  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
5.  physics a dimension or quantity of sufficient size to be unaffected by finite variations
6.  maths the concept of a value greater than any finite numerical value
7.  a distant ideal point at which two parallel lines are assumed to meet

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from O.Fr. infinité, from L. infinitatem (nom. infinitas) "boundlessness," from infinitus boundless, unlimited" (see infinite). Infinitas used as a loan-translation of Gk. apeiria "infinity," from apeiros "endless."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
infinity   (ĭn-fĭn'ĭ-tē)  Pronunciation Key 
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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Computing Dictionary

infinity definition

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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Example sentences
Beyond the infinity pool at this house are views of dunes and the ocean.
For a brief but incandescent moment, a blip in the infinity of time, the room
  is perfection itself.
They're small, but when computing an average, only a little infinity is needed
  to take the average all the way.
Infinity has no beginning or end, no middle or edge.
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