The Collaborative International Dictionary of English v.0.48:

Head \Head\ (h[e^]d), v. t. [imp. & p. p. Headed; p. pr. & vb.
   n. Heading.]
   1. To be at the head of; to put one's self at the head of; to
      lead; to direct; to act as leader to; as, to head an army,
      an expedition, or a riot. --Dryden.
      [1913 Webster]

   2. To form a head to; to fit or furnish with a head; as, to
      head a nail. --Spenser.
      [1913 Webster]

   3. To behead; to decapitate. [Obs.] --Shak.
      [1913 Webster]

   4. To cut off the top of; to lop off; as, to head trees.
      [1913 Webster]

   5. To go in front of; to get in the front of, so as to hinder
      or stop; to oppose; hence, to check or restrain; as, to
      head a drove of cattle; to head a person; the wind heads a
      ship.
      [1913 Webster]

   6. To set on the head; as, to head a cask.
      [1913 Webster]

   To head off, to intercept; to get before; as, an officer
      heads off a thief who is escaping. "We'll head them off at
      the pass."

   To head up,
      (a) to close, as a cask or barrel, by fitting a head to.
      (b) To serve as the leader of; as, to head up a team of
          investigators.
          [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Heading \Head"ing\, n.
   1. The act or state of one who, or that which, heads;
      formation of a head.
      [1913 Webster]

   2. That which stands at the head; title; as, the heading of a
      paper.
      [1913 Webster]

   3. Material for the heads of casks, barrels, etc.
      [1913 Webster]

   4. (Mining, tunneling)
      (a) A gallery, drift, or adit in a mine; the vein above a
          drift.
      (b) The end of a drift or gallery; also, the working face
          at the end of a tunnel, gallery, drift, or adit from
          which the work is advanced.
          [1913 Webster +RDH]

   5. (Sewing) The extension of a line ruffling above the line
      of stitch.
      [1913 Webster]

   6. (Masonry) That end of a stone or brick which is presented
      outward. --Knight.
      [1913 Webster]

   Heading course (Arch.), a course consisting only of
      headers. See Header, n. 3
      (a) .

   Heading joint.
      (a) (Carp.) A joint, as of two or more boards, etc., at
          right angles to the grain of the wood.
      (b) (Masonry) A joint between two roussoirs in the same
          course.
          [1913 Webster]

WordNet (r) 3.0 (2006):

heading
    n 1: a line of text serving to indicate what the passage below
         it is about; "the heading seemed to have little to do with
         the text" [syn: heading, header, head]
    2: the direction or path along which something moves or along
       which it lies [syn: bearing, heading, aim]
    3: a horizontal (or nearly horizontal) passageway in a mine;
       "they dug a drift parallel with the vein" [syn: drift,
       heading, gallery]