1) An expression in parentheses 2) Content 3) Message 4) Parenthetic 5) Qualifying or explaining 6) Subject matter 7) Substance 1) Incidental 2) Parenthetic 
• (a.) Of the nature of a parenthesis; pertaining to, or expressed in, or as in, a parenthesis; as, a parenthetical clause; a parenthetic remark. • (a.) Using or containing parentheses.
parenthetic, parenthetical Additional words which are often casual, irrelevant, and superfluous; but they may also be significant bits of information that come to the speaker spontaneously and are deemed important enough to be mentioned. Commas, dashes, and brackets may also be used to set off such material when writing.