Interestingly, the word humour has connotations based on physical well-being and is related to moisture in such a way as to imply that variations in perspiration have an effect on one’s humour and temperament. It is quite literally a fluid of the animal body, and it determines not only temperament, but also disposition and state of mind. An inclination towards good humour is better than ill humoured. It could also be defined as a mental faculty which finds delight in ludicrous and mirthful ideas, and anything that provides amusement. In all these respects it is primarily a noun, however this word can also be used as a verb. To humour (somebody) would be to indulge or gratify by compliance.
There are a multitude of other words which further describe ‘humour’ such as funniness, comic side, funny side, comical aspect, comedy, farce, jocularity, hilarity, ludicrousness, absurdity, jokes, joking, jests, gags, wit, pleasantries, buffoonery, wisecracks, mood, temper, frame of mind, and spirits.
The roots of this word are from the Latin (h)umor - (h)umere which means to be moist.