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Definition of infinity noun from the Oxford Advanced Learner's Dictionary

infinity

noun
 
/ɪnˈfɪnəti/
 
/ɪnˈfɪnəti/
(plural infinities)
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  1. [uncountable]
    (also infinities [plural])
    the state of having no end or limit
    • the infinity/infinities of space
  2. [uncountable] a point far away that can never be reached
    • The landscape seemed to stretch into infinity.
    Extra Examples
    • He could have jumped off the cliff into infinity.
    • In this weather the cliff face was a foggy drop into infinity.
    • Theoretically, a line can extend into infinity.
    • Parallel lines appear to meet at infinity.
    Oxford Collocations Dictionaryverb + infinity
    • extend into
    • extend to
    • stretch into
    preposition
    • at infinity
    • into infinity
    See full entry
  3. (symbol )
    [uncountable, countable] (mathematics) a number larger than any other
    • The number tends towards infinity.
    Topics Maths and measurementc1
    Oxford Collocations Dictionaryverb + infinity
    • approach
    • tend to
    • tend towards/​toward
    preposition
    • at infinity
    See full entry
  4. [singular] a large amount that is impossible to count
    • an infinity of stars
  5. Word Originlate Middle English: from Old French infinite or Latin infinitas, from infinitus, from in- ‘not’ + finitus ‘finished, finite’, past participle of finire, from finis ‘end’.
See infinity in the Oxford Advanced American DictionarySee infinity in the Oxford Learner's Dictionary of Academic English

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