From pro and histemi; to stand before, i.e. (in rank) to preside, or (by implication) to practise -- maintain, be over, rule.
see GREEK pro
see GREEK histemi
1. in the transitive tenses to set or place before; to set over.
2. in the perfect pluperfect and 2 aorist active and in the present and imperfect middle a. to be over, to superintend, preside over (A. V. rule) (so from Herodotus down): 1 Timothy 5:17; with a genitive of the person or thing over which one presides, 1 Thessalonians 5:12; 1 Timothy 3:4f, 12.
b. to be a protector or guardian; to give aid (Euripides, Demosthenes, Aeschines, Polybius): Romans 12:8 ((others with A. V. to rule; cf. Fritzsche at the passage; Stuart, commentary, excurs. xii.)).
c. to care for, give attention to: with a genitive of the thing, καλῶν ἔργων, Titus 3:8, 14; for examples from secular writings see Kypke and Lösner; (some (cf. R. V. marginal reading) would render these two examples profess honest occupations (see ἔργον, 1); but cf. ἔργον, 3, p. 248b middle and Field, Otium Norv. pars iii, at the passage cited).