Summons

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Middle English: from Old French sumunse, from an alteration of Latin summonita, feminine past participle of summonere (see summon).

wiktionary

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From Middle English somouns(“order or command to do something”), borrowed from Old French sumunce (modern French semonce), from Vulgar Latin *summonsa, a noun use of the feminine past participle of summoneō, summonēre(“to summon”).

See the etymology of the corresponding lemma form.

etymonline

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summons (n.)

"authoritative call to be at a certain place for a certain purpose," late 13c., from Old French sumunse, noun use of fem. past participle of somondre (see summon (v.)). As a verb from 1650s.