American English

Definition of apostrophe noun from the Oxford Advanced American Dictionary



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  1. 1the mark ( ’ ) used to show that one or more letters or numbers have been left out, as in she's for she is and '63 for 1963
  2. 2the mark ( ’ ) used before or after the letter “s” to show that something belongs to someone, as in Sam's watch and the horses' tails
  3. 3the mark ( ’ ) used before the letter “s” to show the plural of a letter or number, as in How many 3's are there in 9? and There are two m's in “comma.”
See the Oxford Advanced Learner's Dictionary entry: apostrophe