A means of altering one's appearance or concealing one's identity. He wore a disguise to avoid being recognized by his fans.
A costume or outfit used to change one's appearance. The spy's disguise included a wig and fake mustache.
A false appearance or manner intended to deceive. Her cheerful demeanor was just a disguise for her true feelings.
The act or practice of disguising; the condition of being disguised. In the world of espionage, disguise is often a matter of life and death.