Definition of infinity
infinities
1a : the quality of being infiniteb : 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 numberb : 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 (as alephnull)
4 : a distance so great that the rays of light from a point source at that distance may be regarded as parallel
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.
14th Century
First Known Use of infinity
14th century
Other Mathematics and Statistics Terms
INFINITY Defined for English Language Learners
infinity
playDefinition of infinity for English Language Learners

: 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
INFINITY Defined for Kids
infinity
playDefinition of infinity for Students
infinities
1 : the quality of being without limits <the infinity of space>
2 : a space, quantity, or period of time that is without limit
Learn More about infinity

See words that rhyme with infinity Thesaurus: All synonyms and antonyms for infinity Spanish Central: Translation of infinity Nglish: Translation of infinity for Spanish speakers Britannica English: Translation of infinity for Arabic speakers Britannica.com: Encyclopedia article about infinity
Seen and Heard
What made you want to look up infinity? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!