proof

B2Frequent NGSL-3
UK /pruːf/US /pruːf/

Meaning

noun
information, documents, etc. that show that something is true
conclusive/definitive/scientific proof

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And further proof that Langley was motivated by the wrong thing: the day the Wright brothers took flight, he quit.

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And further proof that Langley was motivated by the wrong thing: the day the Wright brothers took flight, he quit.

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