Definition of billboard
(Entry 1 of 2)
: a flat surface (as of a panel, wall, or fence) on which bills are posted
specifically
: a large panel designed to carry outdoor advertising
billboard
verb
billboarded; billboarding; billboards
Definition of billboard (Entry 2 of 2)
: to promote by a conspicuous display on or as if on a billboard
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Merriam-Webster unabridged
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Time Traveler for billboard
The first known use of billboard was in 1843
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