To deprive; to take away from someone (archaic or rare variant of deprive).
From Latin deprivatus (past participle of deprivare). This is an older variant form of 'deprive,' showing how Latin conjugation sometimes produced different English word forms in historical texts.
Deprivate is so archaic that most modern English speakers would have no idea it means 'deprive.' Linguists find such abandoned variants fascinating because they show how English pruned its vocabulary over centuries, keeping only the strongest forms.
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