Meaning of “probation” - Learner’s Dictionary

probation

noun [ U ] uk us /prəʊˈbeɪʃən/
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

(Definition of “probation” from the Cambridge Learner’s Dictionary © Cambridge University Press)