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]

Moby Thesaurus II by Grady Ward, 1.0:

187 Moby Thesaurus words for "heading":
   aim, antecedent, anteposition, anteriority, azimuth, banner,
   banner head, basis, bearing, bent, blood, bold front, bracket,
   branch, brave face, brave front, burden, cap, capping, capsheaf,
   caption, caput, case, caste, category, chapter, chief, clan, class,
   compass direction, concern, consummating, course, crest, crown,
   crowning, culminating, current, direction, direction line, display,
   division, drift, drop head, dropline, epigraph, essence, estate,
   facade, face, facet, facia, first, focus of attention,
   focus of interest, fore, forefront, foregoing, foreground,
   forehand, foreland, foremost, forepart, forequarter, foreside,
   foreword, front, front elevation, front man, front matter,
   front page, front view, frontage, frontal, frontier, frontispiece,
   gist, grade, group, grouping, hanger, head, headline, headmost,
   headpiece, helmsmanship, inclination, issue, jump head, kin, label,
   lap, lay, le pas, leading, legend, level, lie, line,
   line of direction, line of march, living issue, main point, matter,
   matter in hand, meat, motif, motive, motto, navigation, obverse,
   order, orientation, outtopping, overline, overtopping, pigeonhole,
   piloting, pinhead, point, point at issue, point in question,
   position, precedence, precedent, preceding, precessional,
   precursor, precursory, predicament, preface, prefix, prior,
   priority, problem, proscenium, quarter, question, race, range,
   rank, rating, rubric, run, running head, running title, scarehead,
   screamer, section, sept, set, spread, spreadhead, station, status,
   steerage, steering, strain, stratum, streamer, subdivision,
   subgroup, subhead, subheading, subject, subject matter,
   subject of thought, suborder, substance, subtitle, superscription,
   tendency, tenor, text, the lead, theme, title, title page, topic,
   topknot, topping, track, trend, van, vector, way,
   window dressing