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English definition of “apostrophe”

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apostrophe

noun [C] uk   /əˈpɒs.trə.fi/ us    /-ˈpɑː.strə-/
B2 the symbol ’ used in writing to show when a letter or a number has been left out, as in I'm (= I am) or '85 (= 1985), or that is used before or after s to show possession, as in Helen's house or babies' hands: "It's" with an apostrophe means "it is" or "it has". sometimes used before s to show the plural of a number or a letter: There are two p's in "supper".
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(Definition of apostrophe from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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