n. the characters ( ), parentheses are used to separate material that is nonessential information in a sentence or additional inormation from the very important information in a sentence; text enclosed in parentheses; act of isolating by parentheses (Syntax)
PARENTHESIS
Meaning of PARENTHESIS in English
Explanatory English dictionary bed edition. Толковый словарь английского языка Редакция bed. 2012