Numerous

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late Middle English: from Latin numerosus, from numerus ‘a number’.

wiktionary

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From Middle English numerous from Latin numerōsus(“numerous, abundant; harmonious”), from numerus(“number”). Doublet of numerose.

etymonline

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numerous (adj.)

early 15c., "consisting of a large number," from Latin numerosus "numerous," from numerus "a number" (see number (n.)). Related: Numerously; numerousness.