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Noun: id  id
  1. (psychoanalysis) primitive instincts and energies underlying all psychic activity
Contraction: I'd  Id
  1. I would; I should; I had
Noun: ID
  1. A state in the Rocky Mountains
    - Idaho, Gem State
     
  2. A card or badge used to identify the bearer
    "you had to show your ID in order to get in";
    - I.D.

Derived forms: IDs, ids

Type of: American state, badge, inherent aptitude, instinct, positive identification

Part of: America, the States, U.S., U.S.A., unconscious, unconscious mind, United States, United States of America, US, USA

Encyclopedia: Id, ego & super-ego

I'd

ID