feast (v.) Look up feast at Dictionary.com
c.1300, "partake of a feast," from Old French fester, from feste (see feast (n.)). Related: Feasted; feasting.
feast (n.) Look up feast at Dictionary.com
c.1200, "religious anniversary characterized by rejoicing" (rather than fasting), from Old French feste (12c., Modern French fête) "religious festival; noise, racket," from Vulgar Latin *festa (fem. singular; also source of Italian festa, Spanish fiesta), from Latin festa "holidays, feasts," noun use of neuter plural of festus "festive, joyful, merry," related to feriae "holiday" and fanum "temple," from PIE *dhes- "root of words in religious concepts" [Watkins]. The spelling -ea- was used in Middle English to represent the sound we mis-call "long e." Meaning "abundant meal" (whether public or private) is from late 14c.