1820, "temper" (usually in a hostile sense), from Latin animus "rational soul, mind, life, mental powers; courage, desire," related to anima "living being, soul, mind, disposition, passion, courage, anger, spirit, feeling," from PIE root *ane- "to blow, to breathe" (cognates: Greek anemos "wind," Sanskrit aniti "breathes," Old Irish anal, Welsh anadl "breath," Old Irish animm "soul," Gothic uzanan "to exhale," Old Norse anda "to breathe," Old English eðian "to breathe," Old Church Slavonic vonja "smell, breath," Armenian anjn "soul"). It has no plural. As a term in Jungian psychology for the masculine component of a feminine personality, it dates from 1923.