Etymology
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parenthetical (adj.)

"of pertaining to, or of the nature of a parenthesis," 1620s, from Medieval Latin parentheticus from Greek parenthetos "put in beside," verbal adjective from parentithenai (see parenthesis) + -al (1). Related: Parenthetically.

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Definitions of parenthetical
1
parenthetical (n.)
an expression in parentheses;
his writing was full of parentheticals
Synonyms: parenthetical expression
2
parenthetical (adj.)
qualifying or explaining; placed or as if placed in parentheses;
parenthetical remarks
Synonyms: parenthetic
From wordnet.princeton.edu