Definitions
1.nounA word or phrase within parentheses.
2.noun(screenwriting) A descriptor or modifier enclosed within parentheses and put, indented, in a line of dialogue to describe how it should be acted or directed onscreen.
3.adjectiveUsing, containing, or within parentheses (like this)
4.adjectiveThat explains or qualifies something
5.adjectiveThat is incidental