a person who is in a trial period (probation) at a new job during which their qualifications and performance are tested;
e.g. A probationer is not likely to be given any critical or long-term assignments.
(noun)
a person guilty of a criminal act whose sentence has been temporarily suspended as a reward for good behavior and who has thus been allowed to go free while remaining under supervision;
e.g. There is a long list of conditions a probationer must meet to retain their freedom.