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exposition (n.)

late 14c., exposicioun, "explanation, narration," from Old French esposicion "explanation, interpretation" (12c.) and directly from Latin expositionem (nominative expositio) "a setting or showing forth; narration, explanation," noun of action from past-participle stem of exponere "put forth; explain; expose," from ex "from, forth" (see ex-) + ponere "to put, place" (see position (n.)).

The meaning "public display" is attested by 1851 in reference to the Crystal Palace Exposition in London. Abbreviation Expo is recorded from 1963, in reference to planning for the world's fair held in Montreal in 1967.

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Definitions of exposition from WordNet

exposition (n.)
a systematic interpretation or explanation (usually written) of a specific topic;
Synonyms: expounding
exposition (n.)
an account that sets forth the meaning or intent of a writing or discourse;
we would have understood the play better if there had been some initial exposition of the background
exposition (n.)
(music) the section of a movement (especially in sonata form) where the major musical themes first occur;
exposition (n.)
a collection of things (goods or works of art etc.) for public display;
Synonyms: exhibition / expo
From wordnet.princeton.edu