1. immeasurably great: an infinite capacity for forgiveness.
  2. indefinitely or exceedingly great: infinite sums of money.
  3. unlimited or unmeasurable in extent of space, duration of time, etc.: the infinite nature of outer space.
  4. unbounded or unlimited; boundless; endless: God's infinite mercy.
  5. Mathematics.
    1. not finite.
    2. (of a set) having elements that can be put into one-to-one correspondence with a subset that is not the given set.
  1. something that is infinite.
  2. Mathematics. an infinite quantity or magnitude.
  3. the boundless regions of space.
  4. the Infinite (Being), God.

Origin of infinite

1350–1400; Middle English < Latin infīnītus boundless. See in-3, finite
Related formsin·fi·nite·ly, adverbin·fi·nite·ness, nounnon·in·fi·nite, adjective, nounnon·in·fi·nite·ly, adverbnon·in·fi·nite·ness, nounqua·si-in·fi·nite, adjectivequa·si-in·fi·nite·ly, adverbsu·per·in·fi·nite, adjectivesu·per·in·fi·nite·ly, adverbsu·per·in·fi·nite·ness, nounun·in·fi·nite, adjectiveun·in·fi·nite·ly, adverbun·in·fi·nite·ness, noun

Synonyms for infinite

Antonyms for infinite Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for quasi-infinite


    1. having no limits or boundaries in time, space, extent, or magnitude
    2. (as noun; preceded by the)the infinite
  1. extremely or immeasurably great or numerousinfinite wealth
  2. all-embracing, absolute, or totalGod's infinite wisdom
  3. maths
    1. having an unlimited number of digits, factors, terms, members, etcan infinite series
    2. (of a set) able to be put in a one-to-one correspondence with part of itself
    3. (of an integral) having infinity as one or both limits of integrationCompare finite (def. 2)
Derived Formsinfinitely, adverbinfiniteness, noun
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

Word Origin and History for quasi-infinite



late 14c., "eternal, limitless," also "extremely great in number," from Old French infinit "endless, boundless," and directly from Latin infinitus "unbounded, unlimited," from in- "not, opposite of" (see in- (1)) + finitus "defining, definite," from finis "end" (see finish). The noun meaning "that which is infinite" is from 1580s.

Online Etymology Dictionary, © 2010 Douglas Harper

quasi-infinite in Science


  1. Relating to a set that can be put into a one-to-one correspondence with some proper subset of its own members.
  2. Relating to or being a numerical quantity describing the size of such a set.
  3. Being without an upper or lower numerical bound.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.