Dictionary

The upper portion of a page (or other) layout.

Example: If you reduce the header of this document, the body will fit onto a single page.

Text, or other visual information, used to mark off a quantity of text, often titling or summarizing it.

Example: Your header is too long; "Local Cannibals" will suffice.

Text, or other visual information, that goes at the top of a column of information in a table.

Example: That column should have the header "payment status".

A font, text style, or typesetting used for any of the above.

Example: Parts of speech belong in a level-three header. Level-two headers are reserved for the name of the language.

To strike (a ball) with one's head.

A file, usually in the form of source code, that is automatically included in another source file by the compiler.

A file that contains declarations but no implementations.