Definition of headings:
(n) :
The title or topic of a document, article, chapter, or of a section thereof.
(n) :
(nautical and aeronautical) The direction into which a seagoing or airborne vessel's bow is pointing (apparent heading) and/or the direction into which it is actually moving relative to the ground (true heading)
(n) :
Material for the heads of casks, barrels, etc.
(n) :
(mining) A gallery, drift, or adit in a mine, particularly one driving through a solid body of coal or ore; also, the end of a drift or gallery; the vein above a drift.
(n) :
(sewing) The extension of a line ruffling above the line of stitch.
(n) :
(masonry) The end of a stone or brick which is presented outward.