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In psychology , affect is used to describe mood, especially a change in mood. However, while affect may describe mood, the two are completely different in meaning. Mood is a state of feeling (emotional), usually temporary, resulting from a specific stimulus. The word is derived from an ancient English word âmodâ which meant courage especially during war times.
Princeton's WordNet(4.50 / 4 votes)Rate this definition: 1  affect(verb) the conscious subjective aspect of feeling or emotion. 2  affect, impact, bear upon, bear on, touch on, touch(verb) have an effect upon. 3  affect(verb) act physically on; have an effect upon. 4  involve, affect, regard(verb) connect closely and often incriminatingly.