Definitions

1. noun

a set of clothes worn on a particular occasion or to represent a particular character or occupation

“The actress wore a elaborate costume to the awards ceremony.”

2. verb

to dress or equip (someone) in a particular costume

“The party will costume the guests as superheroes.”

3. verb

to pretend to be a particular person or character

“She costumed as her favorite movie character for Halloween.”

4. noun

the cost or expense of something, especially the financial cost of producing or selling something

“The cost of the new production was too high to be viable.”