Extended Strong's Greek Lexicon (Abbott-Smith based)
be eager
Usage: ζηλόω, -ῶ [in LXX chiefly for קָנָא pi. ;] __1. to burn with envy or jealousy, to be jealousy: absol., Act.7:9 17:5, 1Co.13:4, Jas.4:2 (R, mg., cf. Mayor, in l). __2. to seek or desire eagerly: with accusative of thing(s), 1Co.12:31 14:1 14:39 (cf. Sir.50:18, Wis.1:12); with accusative of person(s), 2Co.11:2, Gal.4:17; pass., Gal.4:18.† (AS)