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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.


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

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.”
A space, extent of time, or quantity that has no limit.

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]


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