The Collaborative International Dictionary of English v.0.48:

Audition \Au*di"tion\, n. [L. auditio.]
   The act of hearing or listening; hearing.
   [1913 Webster]

         Audition may be active or passive; hence the difference
         between listening and simple hearing.    --Dunglison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

audition
    n 1: the ability to hear; the auditory faculty; "his hearing was
         impaired" [syn: hearing, audition, auditory sense,
         sense of hearing, auditory modality]
    2: a test of the suitability of a performer [syn: audition,
       tryout]
    v 1: perform in order to get a role; "She auditioned for a role
         on Broadway" [syn: audition, try out]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "audition":
   Gedankenexperiment, attention, audibility, audience,
   aural examination, aural sense, auscultation, bench test,
   blue book, bugging, conference, dry run, eager attention, ear,
   eavesdropping, electronic surveillance, exam, examen, examination,
   examination by ear, favorable attention, final, final examination,
   flight test, great go, hearing, heeding, honors, hushed attention,
   interview, listening, listening in, midsemester, midterm, oral,
   oral examination, pilot plan, practical test, practice, prelim,
   quiz, rapt attention, rehearsal, road test, sense of hearing,
   shakedown, shakedown cruise, take-home examination, test,
   test flight, test run, trial, trial run, tripos, tryout, viva,
   wiretapping, workout, written, written examination