Definition of "Humor" :

noun: the trait of appreciating (and being able to express) the humorous

"She didn't appreciate my humor."

noun: the quality of being funny

"I fail to see the humor in it."

noun: the liquid parts of the body

noun: (Middle Ages) one of the four fluids in the body whose balance was believed to determine your emotional and physical state

"The humors are blood and phlegm and yellow and black bile."

noun: a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter

noun: a characteristic (habitual or relatively temporary) state of feeling

"He was in a bad humor."

verb: put into a good mood