in·​fin·​i·​ty | \ in-ˈfi-nə-tē How to pronounce infinity (audio) \
plural infinities

Definition of infinity

1a : the quality of being infinite
b : unlimited extent of time, space, or quantity : boundlessness
2 : an indefinitely great number or amount an infinity of stars
3a : the limit of the value of a function or variable when it tends to become numerically larger than any preassigned finite number
b : a part of a geometric magnitude that lies beyond any part whose distance from a given reference position is finite do parallel lines ever meet if they extend to infinity
c : a transfinite number (such as aleph-null)
4 : a distance so great that the rays of light from a point source at that distance may be regarded as parallel

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Examples of infinity in a Sentence

The view tapers off into infinity. a series of numbers that continues to infinity The night sky was filled with an infinity of stars.
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Recent Examples on the Web The Yaasa ONE Mattress combines cooling infinity foam, comforting transition layers, and a supportive pocket coil system to provide you with a sleep experience that’s cooler, more supportive, and balanced for your own individual needs. Popular Science, "Save big this Labor Day weekend with epic sales on home goods," 7 Sep. 2020 Riehl is currently working to expand the usefulness of infinity categories in mathematics. Quanta Magazine, "Conducting the Mathematical Orchestra From the Middle," 2 Sep. 2020 In addition to a roof garden, there is an 60-foot infinity edge pool, tennis court and an six-slip private dock with boat lift. John-john Williams Iv,, "Hot property: This $24.9 million Annapolis estate is owned by Phillips Seafood CEO," 1 Sep. 2020 But Denver loves Buzz Lightyear to infinity and beyond. Mark Kiszla, The Denver Post, "Kickin’ It with Kiz: Here’s only free-agent QB that could make Broncos bench Drew Lock," 11 Jan. 2020 And to begin proving part of the conjecture, Bloom and Sisask used infinity to make a fresh new argument. Caroline Delbert, Popular Mechanics, "Mathematicians Solve Part of the Weirdest Open Problem Ever," 18 Aug. 2020 For Giggs, the whale is a potent but misleading symbol of the ocean’s infinity, its alterity and expansiveness. Amia Srinivasan, The New Yorker, "What Have We Done to the Whale?," 17 Aug. 2020 Miller painted them and added the infinity symbol on the front. Miller and his partner, Tina Thomas, talked one night about the hearts and came up with a name for handing them out, calling it the Infinite Love Project. Lyndi Mcnulty,, "An Eye for Art: Westminster woodworker, in the business of giving, spreads the message to ‘Be Kind'," 15 Aug. 2020 The building gets its own terrace with an infinity spa-pool and a lounge area where kids can shoot pool. Mark Samuelson, The Denver Post, "Right beside a gondola into Beaver Creek, Riverfront Lodge condos sell fast, with a whole new way of looking at Avon," 20 Mar. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'infinity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of infinity

14th century, in the meaning defined at sense 1a

History and Etymology for infinity

Middle English infinite, borrowed from Anglo-French infinité, borrowed from Latin infīnitāt-, infīnitās, from in- in- entry 1 + fīnis "boundary, limit, terminal point, ending" + -itāt-, -itās -ity — more at final entry 1

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Learn More about infinity

Time Traveler for infinity

Time Traveler

The first known use of infinity was in the 14th century

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Statistics for infinity

Last Updated

12 Sep 2020

Cite this Entry

“Infinity.” Dictionary, Merriam-Webster, Accessed 24 Sep. 2020.

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More Definitions for infinity


How to pronounce infinity (audio)

English Language Learners Definition of infinity

: the quality of having no limits or end : the quality of being infinite
: a space, amount, or period of time that has no limits or end
: a very great number or amount


in·​fin·​i·​ty | \ in-ˈfi-nə-tē How to pronounce infinity (audio) \
plural infinities

Kids Definition of infinity

1 : the quality of being without limits the infinity of space
2 : a space, quantity, or period of time that is without limit

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