Meaning of “ostentatious” in the English Dictionary

"ostentatious" in British English

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ostentatiousadjective

uk /ˌɒs.tenˈteɪ.ʃəs/ us /ˌɑː.stənˈteɪ.ʃəs/ disapproving
ostentatiously
adverb uk /ˌɒs.tenˈteɪ.ʃəs.li/ us /ˌɑː.stənˈteɪ.ʃəs.li/ disapproving

The room was ostentatiously decorated in white and silver.
He took out his gold watch and laid it ostentatiously (= very obviously so everyone would notice) on the table in front of him.

(Definition of “ostentatious” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ostentatious" in American English

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ostentatiousadjective

us /ˌɑs·tənˈteɪ·ʃəs/

intended to attract admiration or notice:

ostentatious jewelry
ostentatious gestures
ostentatiously
adverb us /ˌɑs·tənˈteɪ·ʃəs·li/

She waved her hand about, ostentatiously displaying her large diamond ring.

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