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 There are many ways to practice this, but Crow traces an infinity sign on her leg while slowing her breathing and focusing on the feeling of her finger against her skin. Jennifer Larson, SELF, 7 July 2021 On a recent day at Hong Kong’s Kerry Hotel, a few city dwellers escaped the late-spring heat by wading in the property’s shallow pool, which, with its infinity edges, gave the illusion of spilling into the harbor. Timothy Mclaughlin, The Atlantic, 21 June 2021 It’s the actor’s version of infinity — a new look, a new role, a new possibility. New York Times, 4 May 2021 Of the three teams still standing, Oregon State is the most surprising by a factor of infinity. oregonlive, 29 Mar. 2021 The Hirshhorn’s circle is a little slice of infinity. Kelsey Ables, Washington Post, 25 Mar. 2021 Among the seven pool experiences, the resort boasts the only infinity-edge pool on the Strip. Jennifer Kester, Forbes, 24 June 2021 The series walks this fine line between pleasing avid Marvel fans and connecting with viewers who know nothing about infinity stones. Lorraine Ali Television Critic, Los Angeles Times, 23 June 2021 And at the top of the cliff, an infinity-edge pool lines the hotel's central lounge area and extends all the way to the restaurant, Taverna. Maya Kachroo-levine, Travel + Leisure, 16 June 2021

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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Dictionary Entries Near infinity



infinity pool

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Statistics for infinity

Last Updated

15 Jul 2021

Cite this Entry

“Infinity.” Dictionary, Merriam-Webster, Accessed 4 Aug. 2021.

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More Definitions for infinity



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

More from Merriam-Webster on infinity

Nglish: Translation of infinity for Spanish Speakers

Britannica English: Translation of infinity for Arabic Speakers Encyclopedia article about infinity


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