imperativus
From LSJ
τὸ δ' ἡδέως ζῆν καὶ ἱλαρῶς οὐκ ἔξωθέν ἐστιν, ἀλλὰ τοὐναντίον ὁ ἄνθρωπος τοῖς περὶ αὑτὸν πράγμασιν ἡδονὴν καὶ χάριν ὥσπερ ἐκ πηγῆς τοῦ ἤθους προστίθησιν → but a pleasant and happy life comes not from external things, but, on the contrary, man draws on his own character as a source from which to add the element of pleasure and joy to the things which surround him
Latin > English (Lewis & Short)
impĕrātīvus: (inp-), a, um, adj. impero,
I of or proceeding from a command, commanded: feriae, extraordinary, commanded by a magistrate, Macr. S. 1, 16, § 5 sq.: modus, the imperative, Mart. Cap. 3, § 313, and in the grammarians saep.— Adv.: impĕrātīvē, imperatively, Ulp. Reg. tit. 24, 1.