noun The upper portion of a page (or other) layout.
If you reduce the header of this document, the body will fit onto a single page.
noun Text, or other visual information, used to mark off a quantity of text, often titling or summarizing it.
Your header is too long; "Local Cannibals" will suffice.
noun Text, or other visual information, that goes at the top of a column of information in a table.
That column should have the header "payment status".
noun A font, text style, or typesetting used for any of the above.
Parts of speech belong in a level-three header. Level-two headers are reserved for the name of the language.
noun The first part of a file or record that describes its contents.
The header includes an index, an identifier, and a pointer to the next entry.
noun Clipping of header file.
noun the first part of a packet or stream, often containing its address and descriptors.
The encapsulation layer adds an eight-byte header and a two-byte trailer to each packet.
noun A brick that is laid sideways (on its largest face), for example at the top of a wall or within the brickwork, with its smallest side showing (oriented so that that side is wider than it is tall).