Meaning

noun a new convert being taught the principles of Christianity by a catechist

originFrom Middle English cathecumynys pl, from Middle French cathecumin (modern French catéchumène) or Ecclesiastical Latin catēchūmenus, itself a borrowing from Ancient Greek κατηχούμενος (katēkhoúmenos, “being instructed”), present participle passive of κατηχέω (katēkhéō, “sound through, instruct orally, catechise”), from κατά (katá, “down”) + ἠχή (ēkhḗ, “sound”).

Etymology from Wiktionary, CC BY-SA 3.0