The Collaborative International Dictionary of English v.0.48:

Discard \Dis*card"\, v. i. (Card Playing)
   To make a discard.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Discard \Dis*card"\, n. (Card Playing)
   The act of discarding; also, the card or cards discarded.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Discard \Dis*card"\, v. t. [imp. & p. p. Discarded; p. pr. &
   vb. n. Discarding.]
   1. (Card Playing) To throw out of one's hand, as superfluous
      cards; to lay aside (a card or cards).
      [1913 Webster]

   2. To cast off as useless or as no longer of service; to
      dismiss from employment, confidence, or favor; to
      discharge; to turn away.
      [1913 Webster]

            They blame the favorites, and think it nothing
            extraordinary that the queen should . . . resolve to
            discard them.                         --Swift.
      [1913 Webster]

   3. To put or thrust away; to reject.
      [1913 Webster]

            A man discards the follies of boyhood. --I. Taylor.

   Syn: To dismiss; displace; discharge; cashier.
        [1913 Webster]

WordNet (r) 3.0 (2006):

discard
    n 1: anything that is cast aside or discarded
    2: (cards) the act of throwing out a useless card or of failing
       to follow suit
    3: getting rid something that is regarded as useless or
       undesirable [syn: discard, throwing away]
    v 1: throw or cast away; "Put away your worries" [syn:
         discard, fling, toss, toss out, toss away, chuck
         out, cast aside, dispose, throw out, cast out,
         throw away, cast away, put away]