/ ˌpærənˈθetɪkl; NAmE / (also par·en·thet·ic / -ɪk; NAmE /) adjective
[ usually before noun ] ( formal ) given as extra information in a speech or piece of writing :
parenthetical remarks
► par·en·thet·ic·al·ly / -kli; NAmE / adverb
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WORD ORIGIN
late 18th cent.: from parenthesis , on the pattern of pairs such as synthesis , synthetic .