The Collaborative International Dictionary of English v.0.48:

Half \Half\ (h[aum]f), a. [AS. healf, half, half; as a noun,
   half, side, part; akin to OS., OFries., & D. half, G. halb,
   Sw. half, Dan. halv, Icel. h[=a]lfr, Goth. halbs. Cf.
   Halve, Behalf.]
   1. Consisting of a moiety, or half; as, a half bushel; a half
      hour; a half dollar; a half view.
      [1913 Webster]

   Note: The adjective and noun are often united to form a
         compound.
         [1913 Webster]

   2. Consisting of some indefinite portion resembling a half;
      approximately a half, whether more or less; partial;
      imperfect; as, a half dream; half knowledge.
      [1913 Webster]

            Assumed from thence a half consent.   --Tennyson.
      [1913 Webster]

   Half ape (Zool.), a lemur.

   Half back. (Football) See under 2d Back.

   Half bent, the first notch, for the sear point to enter, in
      the tumbler of a gunlock; the halfcock notch.

   Half binding, a style of bookbinding in which only the back
      and corners are in leather.

   Half boarder, one who boards in part; specifically, a
      scholar at a boarding school who takes dinner only.

   Half-breadth plan (Shipbuilding), a horizontal plan of one
      half a vessel, divided lengthwise, showing the lines.

   Half cadence (Mus.), a cadence on the dominant.

   Half cap, a slight salute with the cap. [Obs.] --Shak.

   At half cock, the position of the cock of a gun when
      retained by the first notch.

   Half hitch, a sailor's knot in a rope; half of a clove
      hitch.

   Half hose, short stockings; socks.

   Half measure, an imperfect or weak line of action.

   Half note (Mus.), a minim, one half of a semibreve.

   Half pay, half of the wages or salary; reduced pay; as, an
      officer on half pay.

   Half price, half the ordinary price; or a price much
      reduced.

   Half round.
      (a) (Arch.) A molding of semicircular section.
      (b) (Mech.) Having one side flat and the other rounded; --
          said of a file.

   Half shift (Mus.), a position of the hand, between the open
      position and the first shift, in playing on the violin and
      kindred instruments. See Shift.

   Half step (Mus.), a semitone; the smallest difference of
      pitch or interval, used in music.

   Half tide, the time or state of the tide equally distant
      from ebb and flood.

   Half time, half the ordinary time for work or attendance;
      as, the half-time system.

   Half tint (Fine Arts), a middle or intermediate tint, as in
      drawing or painting. See Demitint.

   Half truth, a statement only partially true, or which gives
      only a part of the truth. --Mrs. Browning.

   Half year, the space of six months; one term of a school
      when there are two terms in a year.
      [1913 Webster]

WordNet (r) 3.0 (2006):

half note
    n 1: a musical note having the time value of half a whole note
         [syn: half note, minim]