Approval

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Middle English: from Old French aprover, from Latin approbare (see approbate). The original sense was ‘prove, demonstrate’, later ‘corroborate, confirm’, hence ‘pronounce to be satisfactory’ (late Middle English).

wiktionary

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approve +‎  -al

etymonline

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approval (n.)

"commendation, sanction," 1680s, from approve + -al (2). According to OED, "Rare bef. 1800; now generally used instead of" approvance (1590s, from French aprovance).