Definition of humor 

3a : that quality which appeals to a sense of the ludicrous or absurdly incongruous : a funny or amusing quality

// Try to appreciate the humor of the situation.

b : the mental faculty of discovering, expressing, or appreciating the ludicrous or absurdly incongruous : the ability to be funny or to be amused by things that are funny

// a guy with a great sense of humor

c : something that is or is designed to be comical or amusing

// The book is a collection of American humor.

// not a fan of the comedian’s brand of humor

(Source: Merriam-Webster)