G1556–ἐκδικέω–ekdikeō

A widow was in that city, and she often came to him, saying, 'Defend me from my adversary!'

ἐκδίκησόν ekdikēson “do avenge”

yet because this widow bothers me, I will defend her, or else she will wear me out by her continual coming.'"

ἐκδικήσω ekdikēsō “I will avenge”

Don't seek revenge yourselves, beloved, but give place to God's wrath. For it is written, "Vengeance belongs to me; I will repay, says the Lord."

ἐκδικοῦντες, ekdikountes “avenging,”

and being in readiness to avenge all disobedience, when your obedience will be made full.

ἐκδικῆσαι ekdikēsai “to avenge”

They cried with a loud voice, saying, "How long, Master, the holy and true, until you judge and avenge our blood on those who dwell on the earth?"

ἐκδικεῖς ekdikeis “you avenge”

for true and righteous are his judgments. For he has judged the great prostitute, who corrupted the earth with her sexual immorality, and he has avenged the blood of his servants at her hand."

ἐξεδίκησεν exedikēsen “He has avenged”