gradior, _step_ gradī gressus patior, _suffer_ patī passus Compounds of these two verbs have #e# for #a#: as, #ad-gredior#, #per-petior#, #per-pessus#; for forms of #-gredior# in #-īrī#, see 791. [Erratum: 978. (_a_.) (_a_).]