Strong's Concordance

Original word: ἄθλησις
Transliteration: athlésis
Definition (short): conflict
Definition (full): a contest

NAS Exhaustive Concordance

Word Origin: from athleó
Definition: a contest
NASB Translation: conflict (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From athleo; a struggle (figuratively) -- fight.

see GREEK athleo

KJV: But call to remembrance the former days, in which, after ye were illuminated, ye endured a great fight of afflictions;
NASB: But remember the former days, when, after being enlightened, you endured a great conflict of sufferings,