The mood is an affective state, which differs from emotions and feelings for being less specific, less intense and less likely to be provoked by a recent stimulus or event. Etymologically, the word mood derives from the Old English mōd which denoted military courage but could also refer to a person’s humor, temper, or disposition at a particular time. The cognate Gothic mōds translates both θυμός “mood, spiritedness” and ὀργή “anger”.

Mood can have a positive or negative connotation. In common language, we speak according to the cases of “bad mood”, “humor”, or generally “bad” or “good mood”, to indicate a variety of attitudes that can range from euphoria and enthusiasm to irritability, depression or melancholy.