Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: 'other I'

alter ego

 noun
     
al‧ter e‧go [countable]
1MP

somebody's alter ego

an invented person that you use to represent part of your character that is very different from your usual one:
Gissing used his fictional alter ego to attack Victorian morals.
2 someone you trust and who has similar opinions, attitudes etc:
Mrs Reagan was widely regarded as the President's alter ego.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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