Alter Ego Definition

ôltər

alter-egos

noun

Another side of oneself; a second self.

American Heritage

Another aspect of oneself.

Webster's New World

An intimate friend or a constant companion.

American Heritage

A very close friend or constant companion.

Webster's New World

The other self. A doctrine allowing a court to ignore the limited personal liability of a person who acts in a corporate capacity and impose personal liability for the corporation’s wrongful acts when it is shown that the individual was using the corporation to conduct personal business and that there was no real separation between the individual’s and the corporation’s identity. See also corporate (corporate veil).

Webster's New World Law

Synonyms:

Synonyms:
alterum

Other Word Forms of Alter Ego

Noun

Singular:

alter ego

Plural:

alter-egos

Origin of Alter Ego

From Latin "other self", which is a translation of Zeno's Citium "allos ego"

From Wiktionary
Latin alter other ego I, self

From American Heritage Dictionary of the English Language, 5th Edition