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

As night falls, the sky lights up, giving stargazers a glimpse of infinity and beyond. Jennifer Adler, National Geographic, "10 perfect ways to cool off in the U.S.," 27 June 2019 After Brie Larson’s Valentino cape at the Avengers: Endgame events in Seoul back in April and Scarlett Johansson’s bejeweled infinity gauntlets at the Los Angeles screening later that same month, the bar for referential fashion was raised. Janelle Okwodu, Vogue, "Zendaya Wore Couture Fit for a Superhero," 27 June 2019 The luxury villas have infinity plunge pools overlooking the sea (some add full kitchens and private spa amenities); plus two on-site restaurants, a cooking school and a relaxing spa round out the offerings. Alisha Prakash, USA TODAY, "9 remote resorts in Thailand: Luxurious seclusion for when you want to get lost," 20 June 2019 The two 4,400-square-foot penthouse units are designed with an interior courtyard with a Japanese-style Zen garden and a small infinity lap pool. Valerie Sweeten, Houston Chronicle, "Condo Life: The Mondrian at the Museums set to deliver a unique living experience," 16 June 2019 The result underscores the delicate endeavor of situating surfaces in space, as well as the intuition-challenging nature of infinities. Quanta Magazine, "Möbius Strips Defy a Link With Infinity," 20 Feb. 2019 Not to infinity and beyond out there, but a ways down the road nonetheless. (hayne Palmour Iv / San Diego Union-tribune), San Diego Union-Tribune, "Aztecs will play football games for first time vs. SEC school," 7 June 2019 In order to succeed in the next round of Best Baker in America, the bakers’ imaginations need to go to infinity and beyond… literally. Lauren Huff,, "Toy Story 4 characters are on the menu in exclusive Best Baker in America clip," 6 June 2019 The world confronts the mind with myriad impressions, a profusion of other often perplexing beings, and an infinity of possible futures. Ferris Jabr, Harper's magazine, "The Story of Storytelling," 10 Mar. 2019

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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Statistics for infinity

Last Updated

5 Jul 2019

Look-up Popularity

Time Traveler for infinity

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

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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

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