Source : Webster's Revised Unabridged Dictionary (1913)

Probationer \Pro*ba"tion*er\, n.
   1. One who is undergoing probation; one who is on trial; a
      novice.

            While yet a young probationer, And candidate of
            heaven.                               --Dryden.

   2. A student in divinity, who, having received certificates
      of good morals and qualifications from his university, is
      admitted to several trials by a presbytery, and, on
      acquitting himself well, is licensed to preach. [Scot.]

Source : WordNet®

probationer
     n 1: a nurse in training who is undergoing a trial period [syn: {student
          nurse}]
     2: someone released on probation or on parole [syn: {parolee}]