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alter ego

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alter egonoun
pluralalter egos
alter ego
noun
pluralalter egos
Learner's definition of ALTER EGO  
[count]
: a different version of yourself
◊ A character in a book or film is sometimes viewed as an author's alter ego. A role that an actor often plays is sometimes described as the actor's alter ego.
: a close friend who thinks or feels similarly to the way you think or feel
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