Video shows what header means. 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.. Text, or other visual information, that goes at the top of a column of information in a table.. header synonyms: head, heading, bonder, coping, cope, lintel. Header Meaning. How to pronounce, definition audio dictionary. How to say header. Powered by MaryTTS, Wiktionary