Lower1  —adj. (compar. Of *low1). 1 less high in position or status. 2 situated below another part (lower lip). 3 a situated on less high land (lower egypt). B situated to the south (lower california). 4 (of a mammal, plant, etc.) Evolved to only a slight degree. —adv. In or to a lower position, status, etc.  lowermost adj.