G1556 — ekdikeo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ekdikeo — pronounced ek-dik-eh'-o
from 1558; to vindicate, retaliate, punish:--a (re-)venge. see GREEK for 1558
6 occurrences in the KJV.
Luke 18:3
And there was a widow in that city; and she came unto him, saying, Avenge me of mine adversary.
Luke 18:5
Yet because this widow troubleth me, I will avenge her, lest by her continual coming she weary me.
Romans 12:19
Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord.
2 Corinthians 10:6
And having in a readiness to revenge all disobedience, when your obedience is fulfilled.
Revelation 6:10
And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?
Revelation 19:2
For true and righteous are his judgments: for he hath judged the great whore, which did corrupt the earth with her fornication, and hath avenged the blood of his servants at her hand.