imperative
Cross references: 1. masterful 1. im.per.a.tive \im-'per-*t-iv\ aj [LL imperativus, fr. L imperatus, pp. of imperare to command]- more at EMPEROR 1a: of, relating to, or constituting the grammatical mood that expresses t he will to influence the behavior of another 1b: expressive of a command, entreaty, or exhortation 1c: having power to restrain, control, and direct 2: not to be avoided or evaded : URGENT - im.per.a.tive.ly av 2. imperative n 1: the imperative mood or a verb form or verbal phrase expressing it 2: something that is imperative : as 2a: COMMAND, ORDER 2b: RULE, GUIDE 2c: an obligatory act or duty 2d: an imperative judgment or proposition
Webster's English Dictionary