noun

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".”

Synonyms: bonder, cope, coping, head, heading, lintel

verb

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

noun

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

2. A file that contains declarations but no implementations.