Strong's Concordance

Original word: ἐκδικέω
Transliteration: ekdikeó
Definition (short): protect
Definition (full): to vindicate, to avenge

NAS Exhaustive Concordance

Word Origin: from ekdikos
Definition: to vindicate, to avenge
NASB Translation: avenged (1), avenging (1), give...legal protection (2), legal protection (2), punish (1), take...revenge (1).
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Strong's Exhaustive Concordance

From ekdikos; to vindicate, retaliate, punish -- a (re-)venge.

see GREEK ekdikos

KJV: And there was a widow in that city; and she came unto him, saying, Avenge me of mine adversary.
NASB: "There was a widow in that city, and she kept coming to him, saying, 'Give me legal protection from my opponent.'
KJV: Yet because this widow troubleth me, I will avenge her, lest by her continual coming she weary me.
NASB: yet because this widow bothers me, I will give her legal protection, otherwise by continually coming she will wear me out.'"
KJV: Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord.
NASB: Never take your own revenge, beloved, but leave room for the wrath of God, for it is written, "VENGEANCE IS MINE, I WILL REPAY," says the Lord.
KJV: And having in a readiness to revenge all disobedience, when your obedience is fulfilled.
NASB: and we are ready to punish all disobedience, whenever your obedience is complete.