Meaning of “poster” in the English Dictionary

"poster" in British English

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posternoun [ C ]

uk /ˈpəʊ.stər/ us /ˈpoʊ.stɚ/

poster noun [ C ] (PICTURE)

A2 a large printed picture, photograph, or notice that you stick or pin to a wall or board, usually for decoration or to advertise something:

The children put up posters on the classroom walls.
We noticed a poster advertising a circus.
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(Definition of “poster” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"poster" in American English

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posternoun [ C ]

us /ˈpoʊ·stər/

a large printed picture or notice put up for advertising or decoration:

She had a poster of some rock star on the wall.

(Definition of “poster” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"poster" in Business English

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posternoun [ C ]

uk /ˈpəʊstər/ us MARKETING

a large printed picture, photograph, etc., that is used to advertise something in a public place:

The company has been running a large advertising campaign on television, billboards, and posters on London Underground trains.
display/distribute/put up posters
a promotional poster
a poster campaign
poster advertising

(Definition of “poster” from the Cambridge Business English Dictionary © Cambridge University Press)