Abbott-Smith Manual Greek Lexicon
νηστεία (G3521)
5 νηστεία , -ας, ἡ ( νηστεύω ), [in LXX for צוֹם ;] fasting , a fast ; of voluntary abstinence from food: Mt 17:21 (WH, R, txt., om.), Mk 9:29 (WH, txt., R, txt., om.), Lk 2:37 , Ac 14:23 ; of the Day of Atonement, Ac 27:9 ; of involuntary abstinence: II Co 6:5 11:27 .† SYN. : ἀσιτία , q.v.
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain