APOSTROPHE

[noun] [C] - the sign (') used in writing to show that a letter or a number has been omitted, or before or after s to show possessionI'm (= I am)they're (= they are)'65 (= 1965)Helen's laughCharles' cookinga baby's handbabies' handsSee study section: ApostropheAn apostrophe is also sometimes used before s to show the plural of a number or a letter.the 1920'sI always forget there are four s's in possession.See study section: Apostrophe