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Classic usage
Reading level: hard
Estimated CEFR level: C1 — Advanced
Estimated from word frequency; not an official CEFR classification.
For verb: borrowed from Latin probare (“to test, examine, prove”), from probus (“good”). Doublet of prove. For noun: borrowed from Late Latin proba (“a proof”), from probare (“to test, examine, prove”); Doublet of proof. Compare Spanish tienta (“a surgeon's probe”), from tentar (“try, test”); see tempt.
investigation
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Classic usage
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