Banner/ˈbænər/ Definition 1 of 4Pro Tip 1/3Public Expression Banners often display strong beliefs publicly at events. During the rally, each group's banner bore a powerful message. Pro Tip 2/3Size Matters Banners are usually large to make them easily visible in crowds. The striking banner at the protest was visible from far away. Pro Tip 3/3Symbolic Colors Banner colors often represent a cause or organization. The green and white banner symbolized the environmental movement.