Source : Webster's Revised Unabridged Dictionary (1913)

Feast \Feast\ (f[=e]st), n. [OE. feste festival, holiday, feast,
   OF. feste festival, F. f[^e]te, fr. L. festum, pl. festa, fr.
   festus joyful, festal; of uncertain origin. Cf. {Fair}, n.,
   {Festal}, {F[^e]te}.]
   1. A festival; a holiday; a solemn, or more commonly, a
      joyous, anniversary.

            The seventh day shall be a feast to the Lord. --Ex.
                                                  xiii. 6.

            Now his parents went to Jerusalem every year at the
            feast of the passover.                --Luke ii. 41.

   Note: Ecclesiastical fasts are called immovable when they
         always occur on the same day of the year; otherwise
         they are called movable.

   2. A festive or joyous meal; a grand, ceremonious, or
      sumptuous entertainment, of which many guests partake; a
      banquet characterized by tempting variety and abundance of
      food.

            Enough is as good as a feast.         --Old Proverb.

            Belshazzar the King made a great feast to a thousand
            of his lords.                         --Dan. v. 1.

   3. That which is partaken of, or shared in, with delight;
      something highly agreeable; entertainment.

            The feast of reason, and the flow of soul. --Pope.

   {Feast day}, a holiday; a day set as a solemn commemo?ative
      festival.

   Syn: Entertainment; regale; banquet; treat; carousal;
        festivity; festival.

   Usage: {Feast}, {Banquet}, {Festival}, {Carousal}. A feast
          sets before us viands superior in quantity, variety,
          and abudance; a banquet is a luxurious feast; a
          festival is the joyful celebration by good cheer of
          some agreeable event. Carousal is unrestrained
          indulgence in frolic and drink.

Source : WordNet®

feast day
     n : a day designated for feasting [syn: {fete day}]