Released from prison before the sentence is complete, on the condition of following specific rules; freed on parole.
From Old French 'parole' (word, promise), from Latin 'parabola' (word, speech). Originally meant release on one's word of honor, which is why it's called 'parole'—you promised to behave.
The legal meaning of 'parole' perfectly preserves its original sense—you're released on your 'word' (parole) that you'll follow the rules. It's one of the few English legal terms that still clearly shows its Latin meaning of 'word' or 'promise.'
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