DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Tumescence \Tu*mes"cence\, n. [L. tumescens, -entis, p.pr. of
      tumescere to swell up, v. incho. fr. tumere to swell.]
      The act of becoming tumid; the state of being swollen;
      intumescence; -- applied especially to the state of swelling
      of the vascular tissue in the male and female sex organs when
      they have been stimulated to readiness for sexual
      intercourse.
      [Webster 1913 Suppl. +PJC]