Ostentatious is when you show off. Here are some sentences.
That outfit is pure ostentation; go put on something more suitable!
Ostentation is a sign of a vain person.
I paid no attention to the ostentation around me, but listened carefully to what was actually said.
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firstly, ostentation has to do with d pretentiousness display of
a particular thing. Eg article,etc. Now article of ostentation
could be defined as d extravagant consumption or extravagant usage
of a particular commodity. One of d article of ostentation could be
tagged as extravagant spending.
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Ostentation (an excessively showy exhibition) can have these
synonyms based on the context : pretentiousness, gaudiness, pomp,
affectation, or garishness.