From en and kratos; strong in a thing (masterful), i.e. (figuratively and reflexively) self-controlled (in appetite, etc.) -- temperate.
see GREEK en
see GREEK kratos
1. properly, equivalent to ὁ ἐν κράτει ὤν, strong, robust: Aeschylus, Thucydides, and following.
2. having power over, possessed of (a thing), with a genitive of the object; so from (Sophocles and) Herodotus down.
3. mastering, controlling, curbing, restraining: ἀφροδισιων, Xenophon, mere. 1, 2, 1; ἠδωνης, ibid. 4, 5, 10; ἑαυτοῦ, Plato; absolutely (without a genitive), controlling oneself, temperate, continent, ((Aristotle, eth. Nic. 7, 4, p. 1146{b}, 10ff); Sir. 26:15; Wis. 8:21; Philo de Jos. § 11): Titus 1:8.