"costumes" in the noun sense
1. costume
the attire worn in a play or at a fancy dress ball
"he won the prize for best costume"
2. costume
unusual or period attire not characteristic of or appropriate to the time and place
"in spite of the heat he insisted on his woolen costume"
3. costume
the prevalent fashion of dress (including accessories and hair style as well as garments)
4. costume
the attire characteristic of a country or a time or a social class
"he wore his national costume"
"costumes" in the verb sense
1. costume, dress up
dress in a costume
"We dressed up for Halloween as pumpkins"
2. costume
furnish with costumes as for a film or play
Source: WordNet® (An amazing lexical database of English)
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