Extended Strong's Greek Lexicon (Abbott-Smith based)
fasting
Usage: νηστεία, -ας, ἡ (νηστεύω), [in LXX for צוֹם ;] fasting, a fast; __(a) of voluntary abstinence from food: Mat.17:21 (WH, R, txt., om.), Mrk.9:29 (WH, txt., R, txt., om.), Luk.2:37, Act.14:23; of the Day of Atonement, Act.27:9; __(b) of involuntary abstinence: 2Co.6:5 11:27.† SYN.: ἀσιτία, q.v (AS)