late 14c., disposicioun, "ordering, management, a setting in order, arrangement," also "tendency of mind, aptitude, inclination," from Old French disposicion (12c.) "arrangement, order; mood, state of mind" and directly from Latin dispositionem (nominative dispositio) "arrangement, management," noun of action from past-participle stem of disponere "to put in order, arrange" (see dispose).
Meaning "frame of mind, attitude, inclination; temperament, natural tendency or constitution of the mind" (late 14c.) are from astrological use of the word for "position of a planet as a determining influence" (late 14c.). Related: Dispositional.
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