Definition of id noun from the Oxford Advanced Learner's Dictionary

 

id

 noun
noun
BrE BrE//ɪd//
 
; NAmE NAmE//ɪd//
 
(psychology)
 
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the part of the unconscious mind where many of a person’s basic needs, feelings and desires are supposed to exist compare ego, superego Word Origin 1920s: from Latin, literally ‘that’, translating German es. The term was first used in this sense by Freud, following use in a similar sense by his contemporary, Georg Groddeck.
See the Oxford Advanced American Dictionary entry: id