Plural

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late Middle English: from Old French plurel or Latin pluralis, from plus, plur- ‘more’.

wiktionary

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From Middle English plurelle, from Old French plurel(“plural”), borrowed from Latin pluralis(“of or belonging to more than one, belonging to many”, adjective), from plus, pluris(“more”) + -alis.

etymonline

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plural (adj.)

late 14c., originally in grammar (distinguished from singular), "containing or consisting of more than one," from Old French plurel "more than one" (12c., Modern French pluriel) and directly from Latin pluralis "of or belonging to more than one," from plus (genitive pluris) "more" (see plus). The noun meaning "a plural number" is from late 14c.