Financial

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ref

late Middle English: from Old French, from finer ‘make an end, settle a debt’, from fin ‘end’ (see fine2). The original sense was ‘payment of a debt, compensation, or ransom’; later ‘taxation, revenue’. Current senses date from the 18th century, and reflect sense development in French.

wiktionary

ref

finance +‎  -ial

etymonline

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financial (adj.)

1769, from finance (n.) + -ial. Related: Financially.