less high in position:the lower levels of the building
less high in status or amount:managers lower down the hierarchylower costs will encourage people to buy
(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 CretaceousLower Palaeolithic
[in place names] situated to the south:the union of Upper and Lower Egypt