Valuable

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Middle English: from Old French, feminine past participle of valoir ‘be worth’, from Latin valere .

wiktionary

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value +‎  -able

etymonline

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valuable (adj.)

"of great value or price," 1580s, from value (v.) + -able. As a noun, "a valuable thing," from 1775 (in modern use often in plural). Related: Valuably.