Narcissism is a personality trait where an individual's thoughts and actions are dominated by egotism, vanity, pride and selfishness. It is best characterized by a feeling that nothing external to the person is important except in how it affects the person. The disorder is named after the mythical figure Narcissus, who fell in love with his own reflection in a pool of water.  

Narcissistic personality disorder is a psychiatric diagnosis where a person overestimates their abilities and is driven by a need for affirmation and admiration.

Gregory House has often been accused of narcisisstic behavior.

Narcissism at Wikipedia

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