Webster's English Dictionary

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digestion

di.ges.tion \di--'jes(h)-ch*n, d*-\ n : the action, process, or power of 
   digesting : as  : the process of making food absorbable by dissolving it 
   and breaking it  down into simpler chemical compounds that occurs in the 
   living body chiefly through the action of enzymes secreted into the 
   alimentary canal : the process in sewage treatment by which organic matter 
   in sludge is de composed by anaerobic bacteria with the release of a 
   burnable mixture of gases