Psyche (Locke)
WordNet
noun
(1) That which is responsible for one's thoughts and feelings; the seat of the faculty of reason
"His mind wandered"
"I couldn't get his words out of my head"
(2) (Greek mythology) a beautiful princess loved by Cupid who visited her at night and told her she must not try to see him; became the personification of the soul
(3) The immaterial part of a person; the actuating cause of an individual life