The Collaborative International Dictionary of English v.0.48:

Suppuration \Sup`pu*ra"tion\, n. [L. suppuratio: cf. F.
   suppuration.]
   1. The act or process of suppurating.
      [1913 Webster]

   2. The matter produced by suppuration; pus.
      [1913 Webster]

WordNet (r) 3.0 (2006):

suppuration
    n 1: (medicine) the formation of morbific matter in an abscess
         or a vesicle and the discharge of pus [syn: festering,
         suppuration, maturation]
    2: a fluid product of inflammation [syn: pus, purulence,
       suppuration, ichor, sanies, festering]