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“summon” in Latin

The English word summon itself goes back to Latin sub, through summoneo.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

summon
To call out or forth, provocare (to challenge to a contest, whether in jest or in earnest): vocare, evocare ad bellum, etc.; also, simply evocare (to call out to military service): appellare (to go to anybody by way of request, or in a threatening manner): cohortari (to exhort, encourage to a performance): appellare cohortarique: deposcere (to press or urge to a performance, also to challenge to a contest): admonere (to warn with threats; e.g., a debtor to payment). To summon anybody as a witness, testem aliquem citare or excitare: to summon a town, an enemy, to surrender, postulare ut urbs tradatur; denunciare urbi ut se dedat (with threats); hostem ad deditionem invitare (in a gentle manner); denunciare hosti ut se (urbemque) dedat (in a threatening manner): to summon to fight, to battle, lacessere proelium, pugnam.
To cite (before a court), citare (of the herald; a defendant, reum; a witness, testem; Vid: Ernesti, Cl, Cic., s., v.): aliquem in jus vocare or in judicium adducere (of the plaintiff or accuser himself; the former in civil, the latter in criminal cases). ☞ in judicium vocare or arcessere is not Latin.
To convene, convoke, convocare [Vid: CONVENE]. A summoning of Parliament, *ordinum convocatio (convocatio is used in a similar sense, Auctor of Orat., post Red. in Sen., 15, 38).

Quick answer

What is the Latin word for summon?
The usual Latin words for “summon” are prōvocō, vocō, citō; also convocō, ēvocō, appellō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.