The Collaborative International Dictionary of English v.0.48:

Imbibition \Im`bi*bi"tion\, n. [Cf. F. imbibition.]
   The act or process of imbibing, or absorbing; as, the
   post-mortem imbibition of poisons. --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

imbibition
    n 1: (chemistry) the absorption of a liquid by a solid or gel
    2: the act of consuming liquids [syn: drinking, imbibing,
       imbibition]