American English

Definition of parenthesis noun from the Oxford Advanced American Dictionary



    (pl. parentheses
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  1. 1[usually plural] either of a pair of marks, (), placed around extra information in a piece of writing or part of a problem in mathematics Irregular forms are given in parentheses.
  2. 2a word, sentence, etc. that is added to a speech or piece of writing, especially in order to give extra information. In writing, it is separated from the rest of the text using parentheses, commas, or dashes.
See the Oxford Advanced Learner's Dictionary entry: parenthesis