header

Definitions

noun the set of words that appear at the top of each page of a document, e.g. title, author’s name or page number.

noun a packet of data that is sent before a transmission to provide information on destination and routing
noun information at the beginning of a list of data relating to the rest of the data
noun a section of words at the top of a page of a document, giving e.g. the title, author’s name or page number.

A rectangular masonry unit laid across the thickness of a wall, so as to expose its end(s).
A member extending horizontally between two joists to support tailpieces.
In piping, a chamber, pipe, or conduit having several openings through which it collects or distributes material from other pipes or conduits. See also manifold.
The wood surrounding an area of asphaltic concrete paving.

That which appears at the start of something, and which serves to identify, describe, route, control, and so on.
In a file, a region which has information such as the name, size, and date created.
In communications, the first part of a message, packet, or the like. A header may contain information such as the originating and destination stations, the length, protocol utilized, and so on.
In word processing, a text which appears at the top of one or more pages. Such text may appear only on a give page, specified pages, even pages, odd pages, or on every page. Also called page header.
A mounting plate, usually made of glass, through which one or more insulated terminals or leads originating from a hermetically sealed component, device, or piece of equipment are passed. Utilized, for instance, to expose the leads of a transistor, relay, tube, or the like. Such a header also provides support for said terminals or leads.

noun a piece of text that appears at the very top of each page, containing e.g. the chapter name and the page number.
noun the beginning of an e-mail message with full information about the recipient’s address, sender’s name and address and any delivery options

noun a brick or stone positioned crosswise in a wall and level with its outer surface.

noun an unhinged, deranged or unstable person. A version of the earlier headcase, recorded in 2004.

21 definitions in context