banner Definition

banner
noun

1. A large piece of cloth or cardboard, with a design or slogan, etc, carried or displayed at public meetings and parades.

Thesaurus: flag, pennant, emblem, colours, standard, streamer.
2a. loosely
A military flag;
2b. strictly
A square flag bearing the coat of arms or other insignia of a lord, king or emperor, etc and used as a battle standard.
3. A banner headline.
4. A slogan, theme or catchword, etc used to identify or proclaim one's principles or beliefs.

Etymology: 13c in sense 2: from French baniere.