出典:Wiktionary
From Medieval Latin graduālis, from Latin gradus (“step”), from Proto-Indo-European *gʰradʰ-, *gʰredʰ- (“to walk, go”). Cognate with Gothic (griþs, “step, grade”), Bavarian Gritt (“step, stride”).
gradual (comparative more gradual, superlative most gradual)
gradual (複数形 graduals)