Strong's Concordance

Original word: νίκη
Transliteration: niké
Definition (short): victory
Definition (full): victory

NAS Exhaustive Concordance

Word Origin: a prim. word
Definition: victory
NASB Translation: victory (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Apparently a primary word; conquest (abstractly), i.e. (figuratively) the means of success -- victory.
KJV: For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith.
NASB: For whatever is born of God overcomes the world; and this is the victory that has overcome the world-- our faith.