The Collaborative International Dictionary of English v.0.48:

Absumption \Ab*sump"tion\ ([a^]b*s[u^]mp"sh[u^]n; 215), n. [L.
   absumptio. See Absume.]
   Act of wasting away; a consuming; extinction. [Obs.] --Sir T.
   Browne.
   [1913 Webster]