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The word catechumeni could not be parsed. Trying a normal dictionary lookup:
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† cătēchūmĕnus, i, m., and -a, ae, f., = κατηχούμενος, η, one who is receiving elementary instruction in religion, a catechumen, Tert. Praescr. 41 et saep.
In fem., Aug. Ep. ad Euseb. 169; Ambros. Ep. 34.