Source : Webster's Revised Unabridged Dictionary (1913)

Compress \Com*press"\, v. t. [imp. & p. p. {Compressed}; p. pr &
   vb. n. {Compressing}.] [L. compressus, p. p. of comprimere to
   compress: com- + premere to press. See Press.]
   1. To press or squeeze together; to force into a narrower
      compass; to reduce the volume of by pressure; to compact;
      to condense; as, to compress air or water.

            Events of centuries . . . compressed within the
            compass of a single life.             --D. Webster.

            The same strength of expression, though more
            compressed, runs through his historical harangues.
                                                  --Melmoth.

   2. To embrace sexually. [Obs.] --Pope.

   Syn: To crowd; squeeze; condense; reduce; abridge.

Compressed \Com*pressed"\, a.
   1. Pressed together; compacted; reduced in volume by
      pressure.

   2. (Bot.) Flattened lengthwise.

   {Compressed-air engine}, an engine operated by the elastic
      force of compressed air.

Source : WordNet®

compressed
     adj 1: pressed tightly together; "with lips compressed" [syn: {tight}]
     2: reduced in volume by pressure; "compressed air"
     3: flattened laterally along the whole length (e.g., certain
        leafstalks or flatfishes) [syn: {flat}]