Definition of “parenthesis” - English Dictionary

british dictionary

“parenthesis” in British English

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parenthesisnoun [ C ]

uk /pəˈren.θə.sɪs/ us /pəˈren.θə.sɪs/ plural parentheses

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 Learner's Dictionary & Thesaurus © Cambridge University Press)

“parenthesis” in American English

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parenthesisnoun [ C usually pl ]

us /pəˈren·θə·səs/ plural parentheses /pəˈren·θəˌsiz/

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)