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]

Moby Thesaurus II by Grady Ward, 1.0:

80 Moby Thesaurus words for "intake":
   access, adit, admission, air lock, approach, avails, box office,
   commissions, corridor, credit, credits, disposable income,
   dividend, dividends, earned income, earnings, entrance,
   entranceway, entree, entry, entryway, gains, gangplank, gangway,
   gate, gate receipts, get, gross, gross income, gross receipts,
   hall, import, importation, importing, in, income, incoming,
   infiltration, ingoing, ingress, ingression, inlet, input,
   insertion, insinuation, interpenetration, introduction,
   introgression, intrusion, leakage, make, means of access, net,
   net income, net receipts, opening, output, passage, passageway,
   penetration, percolation, proceeds, produce, profits, receipt,
   receipts, receivables, reception, returns, revenue, royalties,
   seepage, take, take-in, takings, unearned income, vestibule, way,
   way in, yield