ID

Definition:

1. [noun] a state in the Rocky Mountains
   Synonyms: Idaho, Gem State, ID
   
   
2. [noun] a card or badge used to identify the bearer; "you had to show your ID in order to get in"
   Synonyms: ID, I.D.
   
   
3. [noun] (psychoanalysis) primitive instincts and energies underlying all psychic activity
   
   

Synonyms:

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