pro ‧ ba ‧ tion ‧ er /prəˈbeɪʃ ə nə $ proʊˈbeɪʃ ə nər/ BrE AmE noun [countable]
1 . someone who has recently started a job, especially nursing or teaching, and who is being tested to see whether they are suitable for it
2 . someone who has broken the law, and has been put on probation