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English definition of “parenthesis”

parenthesis

noun [C] uk   /pəˈren.θə.sɪs/ (plural parentheses) us  
a remark that is added to a sentence, often to provide an explanation or extra information, that is separated from the main part of the sentence by commas, brackets, or dashes: The sentence 'Her youngest sister - the one who lives in Australia - is coming over next summer' contains a parenthesis. in parenthesis If, while you are talking, you say something in parenthesis, you say it as something extra and then continue with the main part of the sentence: Of his origins he said very little, merely mentioning in parenthesis that his background was poor.
(Definition of parenthesis from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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