The Collaborative International Dictionary of English v.0.48:

Intake \In"take`\, n.
   1. The place where water, air, or other substance is taken
      into a pipe, conduit, or machine; -- opposed to outlet.
      [1913 Webster]

   2. the beginning of a contraction or narrowing in a tube or
      cylinder.
      [1913 Webster]

   3. The quantity taken in; as, the intake of air.
      [1913 Webster]

WordNet (r) 3.0 (2006):

intake
    n 1: the process of taking food into the body through the mouth
         (as by eating) [syn: consumption, ingestion, intake,
         uptake]
    2: an opening through which fluid is admitted to a tube or
       container [syn: intake, inlet]
    3: the act of inhaling; the drawing in of air (or other gases)
       as in breathing [syn: inhalation, inspiration,
       aspiration, intake, breathing in]