Etymology
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poster (n.)

"bill, placard, thing posted," 1838, from post (v.1). Poster boy/girl/child "someone given prominence in certain causes" is attested by 1990, in reference to fund-raising drives for charities associated with disability, featuring child sufferers, a feature since 1930s.

Earlier it meant "one who travels post" (c. 1600); "a post-horse" (1797). Sense of "one who posts bills" is by 1864.

updated on September 17, 2020

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Definitions of poster from WordNet

poster (n.)
a sign posted in a public place as an advertisement;
a poster advertised the coming attractions
Synonyms: posting / placard / notice / bill / card
poster (n.)
someone who pastes up bills or placards on walls or billboards;
Synonyms: bill poster / bill sticker
poster (n.)
a horse kept at an inn or post house for use by mail carriers or for rent to travelers;
Synonyms: post horse / post-horse
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.