lower1

adjective

• 1comparative of low¹.

• 2less high:the lower levels of the building managers lower down the hierarchy
• (of an animal or plant) showing relatively primitive or simple characteristics.
• (often Lower) Geology & Archaeology denoting an older (and hence usually deeper) part of a stratigraphic division or archaeological deposit or the period in which it was formed or deposited:Lower Cretaceous Lower Paleolithic

• 3(in place names) situated on less high land or to the south or toward the sea:the sweatshops of the Lower East Side

adverb

• in or into a lower position:the sun sank lower