Ostentation definitions

ŏs'tĕn-tā'shən, -tən-
Ostentation is an overdone, pretentious, vulgar or tacky display of wealth or knowledge.

An example of ostentation is a solid gold toilet seat with diamond-studded flusher.

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Pretentious display meant to impress others; pretentious showiness.
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The act or an instance of showing; an exhibition.
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Showy display, as of wealth or knowledge; pretentiousness.
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Ambitious display; vain show; display intended to excite admiration or applause.
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Origin of ostentation

Originated 1425-75 from late Middle English ostentacioun, from Middle French ostentation, from Latin ostentātiō, equivalent to ostentātus (past participle of ostentāre, to display or exhibit), frequentative of ostendere (to present, display) + -iōn.