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Learned borrowing from Latin catēchēsis, itself borrowed from Ancient Greek κατήχησις (katḗkhēsis), from κατηχέω (katēkhéō, “sound through, instruct orally, catechise”).

catechesis (countable and uncountable, plural catecheses)

Borrowed from Ancient Greek κατήχησις (katḗkhēsis), from Ancient Greek κατηχέω (katēkhéō, “sound through, instruct orally, catechise”).

catēchēsis f (genitive catēchēsis or catēchēseōs or catēchēsios); third declension

Third-declension noun (Greek-type, i-stem).

	singular	plural
nominative	catēchēsis	catēchēsēs catēchēseis
genitive	catēchēsis catēchēseōs catēchēsios	catēchēsium
dative	catēchēsī	catēchēsibus
accusative	catēchēsim catēchēsin catēchēsem	catēchēsēs catēchēsīs
ablative	catēchēsī catēchēse	catēchēsibus
vocative	catēchēsis catēchēsi	catēchēsēs catēchēseis

Found sometimes in Medieval and New Latin.

“catechesis”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
"catechesis", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
“catechesis”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.

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