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Wiktionary
also known as

adv. (context idiomatic English) (non-gloss definition Used to introduce an alternative name nodot=1); alias.

WordNet
also known as

adv. as known or named at another time or place; "Mr. Smith, alias Mr. Lafayette" [syn: alias, a.k.a.]

Usage examples of "also known as".

And I am Satan, the demon of the lower levels, also known as Lucifer, Baal, Beelzebub, and I forget what else they call me.