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



BrE BrE//ˈkɒmə//
; NAmE NAmE//ˈkɑːmə//
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the mark ( , ) used to separate the items in a list or to show where there is a slight pause in a sentence The relative clause is separated by commas. You need to put a comma before ‘which’. see also inverted commas See related entries: Punctuation Word Originlate 16th cent. (originally as a term in rhetoric denoting a group of words shorter than a colon): via Latin from Greek komma ‘piece cut off, short clause’, from koptein ‘cut’.
See the Oxford Advanced American Dictionary entry: comma