Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Late Latin
Origin: Greek, from parentithenai 'to put in'

parenthesis

noun
     
Related topics: Letters and punctuation
pa‧ren‧the‧sis plural parentheses [countable usually plural]
1SLA a round bracket
in parentheses
The figures in parentheses refer to page numbers.
2

in parenthesis

British English in parentheses American English if you say something in parenthesis, you say it while you are talking about something else in order to add information or explain something:
In parenthesis, I should add that the results have not yet been proven.

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