Source : Webster's Revised Unabridged Dictionary (1913)

Abridgment \A*bridg"ment\ (-br[i^]j"ment), n. [OE. abregement.
   See {Abridge}.]
   1. The act of abridging, or the state of being abridged;
      diminution; lessening; reduction or deprivation; as, an
      abridgment of pleasures or of expenses.

   2. An epitome or compend, as of a book; a shortened or
      abridged form; an abbreviation.

            Ancient coins as abridgments of history. --Addison.

   3. That which abridges or cuts short; hence, an entertainment
      that makes the time pass quickly. [Obs.]

            What abridgment have you for this evening? What
            mask? What music?                     --Shak.

   Syn: {Abridgment}, {Compendium}, {Epitome}, {Abstract},
        {Synopsis}.

   Usage: An abridgment is made by omitting the less important
          parts of some larger work; as, an abridgment of a
          dictionary. A compendium is a brief exhibition of a
          subject, or science, for common use; as, a compendium
          of American literature. An epitome corresponds to a
          compendium, and gives briefly the most material points
          of a subject; as, an epitome of history. An abstract
          is a brief statement of a thing in its main points. A
          synopsis is a bird's-eye view of a subject, or work,
          in its several parts.

Source : WordNet®

abridgment
     n : a shortened version of a written work [syn: {condensation},
         {abridgement}, {capsule}]