n. 1.a message whose ingenuity or verbal skill or incongruity has the power to evoke laughter 2.the trait of appreciating (and being able to express) the humorous 3.a characteristic (habitual or relatively temporary) state of feeling 4.the quality of being funny 5.(Middle Ages) one of the four fluids in the body whose balance was believed to determine your emotional and physical state 6.the liquid parts of the body humor v. 1.put into a good mood