probation
/prəʊˈbeɪʃən/ noun [U]
CRIME › a period of time when a criminal must behave well and not commit any more crimes in order to avoid being sent to prison: to be on probation
WORK › a period of time at the start of a new job when you are watched and tested to see if you are suitable for the job
probationary adjective › relating to probation: a probationary period