1. Mischievous, imaginary creatures often depicted as children, who are tricksters, frequently bringing confusion to a situation: The imps appear in children's stories as little creatures who play tricks on humans.
2. An individual typically thought of as a child, who plays tricks and who is generally harmless and somewhat naughty: The little imp has hidden the TV schedule from his father again.

Many school teachers have to deal with imps in their classes.