Real Dictionary

wig
countable noun: A wig is a covering of false hair which you wear on your head, for example because you have little hair of your own or because you want to cover up your own hair.

wig in American English
a false covering of real or synthetic hair for the head, worn as part of a costume, to conceal baldness, etc.
to furnish with a wig or wigs
noun: an artificial covering of hair for all or most of the head, of either synthetic or natural hair, worn to be stylish or more attractive

wig in British English
noun: an artificial head of hair, either human or synthetic, worn to disguise baldness, as part of a theatrical or ceremonial dress, as a disguise, or for adornment
verb: to furnish with a wig

Wig. in British English
abbreviation for: Wigtownshire