n. (pl. parentheses)
1. a a word, clause, or sentence inserted as an explanation or afterthought into a passage which is grammatically complete without it, and usu. marked off by brackets or dashes or commas. b (in pl.) a pair of round brackets () used for this.
2 an interlude or interval.
Phrases and idioms:
in parenthesis as a parenthesis or afterthought.
Etymology: LL f. Gk parenthesis f. parentithemi put in beside