Strong's G3521 — νηστεία (noun)
nesteia (nace-tei'-ah) n.
1. abstinence (from lack of food, or voluntary and religious)
2. (specially) the fast of the Day of Atonement
[from G3522]
KJV: fast(-ing) 
Root(s): G3522 
Hebrew root: νηστεύω
Occurrences: 5