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



    BrE BrE//ɪnˈfɪnəti//
    ; NAmE NAmE//ɪnˈfɪnəti//
    (pl. infinities)
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  1. 1[uncountable] (also infinities [plural]) the state of having no end or limit the infinity/infinities of space
  2. 2[uncountable] a point far away that can never be reached The landscape seemed to stretch into infinity.
  3. 3 (symbol ) [uncountable, countable] (mathematics) a number larger than any other The number tends towards infinity.
  4. 4[singular] a large amount that is impossible to count an infinity of stars
  5. Word Origin late Middle English: from Old French infinite or Latin infinitas, from infinitus, from in- ‘not’ + finitus ‘finished, finite’, past participle of finire, from finis ‘end’.Extra examples He could have jumped off the cliff into infinity. In this weather the cliff face was a foggy drop into infinity. Parallel lines appear to meet at infinity. The usual convention is to choose the reference point at infinity. Theoretically, a line can extend into infinity.
See the Oxford Advanced American Dictionary entry: infinity

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