The definition of a banner is a sign or a flag.
(noun)An example of a banner is a cloth sign bearing a city's motto hung on the front of city hall.
See banner in Webster's New World College Dictionary
noun
Origin: ME banere < OFr baniere < VL *bandaria, ult. < Goth bandwa, a sign
adjective
See banner in American Heritage Dictionary 4
noun
Origin:
Origin: Middle English banere
Origin: , from Old French baniere
Origin: , from Vulgar Latin *bandāria
Origin: , from Late Latin bandum
Origin: , of Germanic origin; see bhā-1 in Indo-European roots
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