noun (n)

• an inflated feeling of pride in your superiority to others(noun.feeling)

  Synonym:
  egotism, self-importance
  

  source: wordnet30
• your consciousness of your own identity(noun.cognition)

  Synonym:
  self
  

  source: wordnet30
• (psychoanalysis) the conscious mind(noun.cognition)

  source: wordnet30
• The conscious and permanent subject of all psychical experiences, whether held to be directly known or the product of reflective thought; -- opposed to non-ego.(noun)

  source: webster1913