header

1. 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.
2. 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.
3. 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".
4. A font, text style, or typesetting used for any of the above. (informal) · Parts of speech belong in a level-three header. Level-two headers are reserved for the name of the language.
5. 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.
6. 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.
7. 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). · This wall has four header courses.
8. A horizontal structural or finish piece over an opening.

Plural headers