IPA: /prəˈbeɪʃənər/
KK: /proʊˈbeɪʃənər/
A person who is undergoing a trial period to prove their abilities or behavior, often in a job or educational setting.
The probationer was eager to show their skills during the training period.
Probationer → It is formed from "probatio" (from Latin, meaning testing or trial) and the suffix "-er" (meaning a person who). A probationer is a person undergoing a trial period to prove their suitability for a role or position.
Think of someone who is in a 'trial' phase ('probatio') to show they can do the job — that's what a probationer is.