The Collaborative International Dictionary of English v.0.48:

Persona \Per*so"na\, n.; pl. Person[ae]. [L.] (Biol.)
   Same as Person, n., 8.
   [1913 Webster]

WordNet (r) 3.0 (2006):

persona
    n 1: an actor's portrayal of someone in a play; "she played the
         part of Desdemona" [syn: character, role, theatrical
         role, part, persona]
    2: (Jungian psychology) a personal facade that one presents to
       the world; "a public image is as fragile as Humpty Dumpty"
       [syn: persona, image]

Moby Thesaurus II by Grady Ward, 1.0:

67 Moby Thesaurus words for "persona":
   an existence, anima, article, being, body, character, coconscious,
   collective unconscious, conscience, conscious self, creature,
   critter, death instinct, ego, ego ideal, ego-id conflict,
   entelechy, entity, ethical self, exterior, facade, face,
   foreconscious, front, guise, id, identity, individual, integer,
   item, libidinal energy, libido, life, mask, mind, module, monad,
   motive force, object, organism, part, person, personality,
   pleasure principle, point, preconscious, primitive self, psyche,
   psychic apparatus, racial unconscious, role, self, single,
   singleton, something, soul, subconscious, subconscious mind,
   subliminal, subliminal self, submerged mind, superego, thing,
   unconscious, unconscious mind, unit, vital impulse