(computing) Provided with a header.

The upper portion of a page (or other) layout. / Text, or other visual information, used to mark off a quantity of text, often titling or summarizing it.

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

plural of header

present participle of header

(sports) A pair of games played one after another between the same teams. / A pair of sporting events, one after the other, at a single venue.

plural of double-header

(programming) Synonym of include guard

plural of header file

(electronics) A type of electrical connector, consisting of one or more rows of male pins evenly spaced apart.