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English definition of “parenthesis”

parenthesis

noun [C usually pl]  /pəˈren·θə·səs/ (plural parentheses  /pəˈren·θəˌsiz/) us  
either of a pair of marks ( ), or the information inside them, used in a piece of writing to show that what is inside these marks should be considered as separate from the main part: Dates in parentheses indicate when the film was reviewed.
(Definition of parenthesis from the Cambridge Academic Content Dictionary © Cambridge University Press)
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