Header n. : One who, or that which, heads nails, rivets, etc., esp. a machine for heading.

Header n. : One who heads a movement, a party, or a mob; head; chief; leader.

Header n. : A brick or stone laid with its shorter face or head in the surface of the wall.

Header n. : In framing, the piece of timber fitted between two trimmers, and supported by them, and carrying the ends of the tailpieces.

Header n. : A reaper for wheat, that cuts off the heads only.

Header n. : A fall or plunge headforemost, as while riding a bicycle, or in bathing; as, to take a header.

Example:
How to keep Header and Footers permanently on every Microsoft Word document?

Taxonomy
free encyclopedia, exhaust manifold, search, free dictionary, supplemental data, data block, PC Hardware, connectors, motherboard, external devices, male style, printed circuit boards, text file, computer programming, printing, typography, body, bicycle.

Defination from the web:
Header (PC Hardware), connectors on a motherboard providing links to external devices. A mainly male style of electrical connector mounted on printed circuit boards ... Page header, in printing or typography the material separated from the main body that appears at the top of a page ...