Source : Webster's Revised Unabridged Dictionary (1913)

Cram \Cram\ (kr[a^]m), v. t. [imp. & p. p. {Crammed} (kr[a^]md);
   p. pr. & vb. n. {Cramming}.] [AS. crammian to cram; akin to
   Icel. kremja to squeeze, bruise, Sw. krama to press. Cf.
   {Cramp}.]
   1. To press, force, or drive, particularly in filling, or in
      thrusting one thing into another; to stuff; to crowd; to
      fill to superfluity; as, to cram anything into a basket;
      to cram a room with people.

            Their storehouses crammed with grain. --Shak.

            He will cram his brass down our throats. --Swift.

   2. To fill with food to satiety; to stuff.

            Children would be freer from disease if they were
            not crammed so much as they are by fond mothers.
                                                  --Locke.

            Cram us with praise, and make us As fat as tame
            things.                               --Shak.

   3. To put hastily through an extensive course of memorizing
      or study, as in preparation for an examination; as, a
      pupil is crammed by his tutor.

Cram \Cram\, v. i.
   1. To eat greedily, and to satiety; to stuff.

            Gluttony . . . . Crams, and blasphemes his feeder.
                                                  --Milton.

   2. To make crude preparation for a special occasion, as an
      examination, by a hasty and extensive course of memorizing
      or study. [Colloq.]

Cram \Cram\, n.
   1. The act of cramming.

   2. Information hastily memorized; as, a cram from an
      examination. [Colloq.]

   3. (Weaving) A warp having more than two threads passing
      through each dent or split of the reed.

Source : WordNet®

cram
     v 1: crowd or pack to capacity; "the theater was jampacked" [syn:
           {jam}, {jampack}, {ram}, {chock up}, {wad}]
     2: put something somewhere so that the space is completely
        filled; "cram books into the suitcase"
     3: study intensively, as before an exam; "I had to bone up on
        my Latin verbs before the final exam" [syn: {grind away},
        {drum}, {bone up}, {swot}, {get up}, {mug up}, {swot up},
        {bone}]
     4: prepare (students) hastily for an impending exam
     [also: {cramming}, {crammed}]