Abbott-Smith Manual Greek Lexicon
ἄθλησις (G119)
1 *† ἄθλησις , -εως, ἡ ( ἀθλέω ), a contest , combat , esp. of athletes; fig., a struggle : He 10:32 (for exx., v. MM, VGT , s.v.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain