Extended Strong's Greek Lexicon (Abbott-Smith based)
to avenge
Usage: ἐκδικέω, -ῶ (ἔκδικος), [in LXX for פָּקַד, נָקַם, שָׁפַט, etc. ;] __1. to vindicate: with accusative of person(s), Luk.18:3, 5. __2. to avenge: with accusative of person(s), ἑαυτούς, Rom.12:19; with accusative of thing(s), παρακοήν, 2Co.10:6; αἷμα, Rev.6:10 19:2 (Cremer, 203; for exx. from π. in both senses, see MM, Exp., xii).† (AS)