'Pseudonym' definitions:

Definition of 'pseudonym'

From: WordNet
noun
A fictitious name used when the person performs a particular social role [syn: pseudonym, anonym, nom de guerre]

Definition of 'Pseudonym'

From: GCIDE
  • Pseudonym \Pseu"do*nym\, n. [Cf. F. pseudonyme. See Pseudonymous.] A fictitious name assumed for the time, as by an author; a pen name; an alias. [Written also pseudonyme.] [1913 Webster]