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 40,000 of them in all, and the cumulative effect is an infinity room spawned in the more banal corners of Getty archives. Chloe Schama, Vogue, "Paola Pivi’s Transporting Exhibition Is a Whimsical Comment on Dark Realities," 15 Nov. 2018 This is how we were born, from the center of the universe and the edges of infinity. Meagan Fredette,, "Transparent Actress Says Jeffrey Tambor Is Getting A Free Pass Amid #MeToo," 12 May 2018 Scarcity and constraints The question raised by the show is how the scarcity imposed by constraints of time and space affect seeing Kusama's explorations of infinity. Steven Litt,, "Kusama 'Infinity Mirrors' show in Toronto offers preview of what's coming to Cleveland (photos)," 6 May 2018 Here's a proof to prove it: The Explanation: The reason this is so hard to grasp is because the concept of infinity is just kind complicated to grasp in the first place. Noelle Devoe, Seventeen, "4 Brain-Busting Math Problems That'll Make You Feel Like You Need to Go Back to Grade School," 21 July 2015 From sparkling infinity rooms to buildings dedicated to ice cream, there’s truly no shortage of options to stage your cultural thirst trap. Liz Stinson, Curbed, "World’s most Instagrammable art exhibition just opened in Tokyo," 17 July 2018 Marley and Me Avengers infinity war Two of the most depressing movies in this world — aka sandman (@MylesGAS) April 27, 2018 Disbelief and grief cloaked us like sweat. Jeneé Osterheldt, kansascity, "New 'Avengers' is so sad you'll cry infinite tears. In the dark. In fetal position | The Kansas City Star," 27 Apr. 2018 Floor-to-ceiling glass walls look onto a plethora of outdoor spaces, filled with infinity swimming pools, fire pits, Travertine stone floors, and private terraces. Megan Barber, Curbed, "Cliffside California mansion fit for a Bond villain asks $30M," 5 Oct. 2018 The property has an infinity-edge pool and spa and tennis court. Ruth Bloomfield, WSJ, "A London Rental Reaches for the Stars," 5 Sep. 2018

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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Time Traveler for infinity

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

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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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Comments on infinity

What made you want to look up infinity? Please tell us where you read or heard it (including the quote, if possible).


to speak slightingly about or to degrade

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