Definitions
1.NounA style of dress, including garments, accessories and hairstyle, especially as characteristic of a particular country, period or people.
2.NounAn outfit or a disguise worn as fancy dress etc."We wore gorilla costumes to the party."
3.NounA set of clothes appropriate for a particular occasion or season."The bride wore a grey going-away costume."
4.NounA swimming costume.
5.VerbTo dress or adorn with a costume or appropriate garb.