The Collaborative International Dictionary of English v.0.48:

Constipation \Con`sti*pa"tion\, n. [L. constipatio a crowding
   together: cf. F. constipation.]
   1. Act of crowding anything into a less compass, or the state
      of being crowded or pressed together; condensation. [Obs.]
      [1913 Webster]

            Fullness of matter, or a pretty close constipation .
            . . of its particles.                 --Boyle.
      [1913 Webster]

   2. A state of the bowels in which the evacuations are
      infrequent and difficult, or the intestines become filled
      with hardened f[ae]ces; costiveness.
      [1913 Webster]

WordNet (r) 3.0 (2006):

constipation
    n 1: irregular and infrequent or difficult evacuation of the
         bowels; can be a symptom of intestinal obstruction or
         diverticulitis [syn: constipation, irregularity]
    2: the act of making something futile and useless (as by
       routine) [syn: stultification, constipation,
       impairment, deadening]