Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “infinity”


noun [U]     /ɪnˈfɪnəti/
SPACE time or space that has no endUnlimited
NUMBER a number that is larger than all other numbersNumbers generally
(Definition of infinity noun from the Cambridge Learner's Dictionary © Cambridge University Press)

Definitions of “infinity” in other dictionaries

Word of the Day


friendly or helpful

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More