Webster's English Dictionary

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ego

ego \'e--(.)go- also 'eg-(.)o-\ n [NL, fr. L, I - more at I] 1: the self 
   esp. as contrasted with another self or the world  2a: EGOTISM  2b: 
   SELF-ESTEEM  3: the conscious part of the personality that is derived from 
   the id throug h contacts with reality and that mediates the demands of id, 
   superego, and external reality