up·per1 / ˈəpər/ • adj. 1. situated above another part: his upper arm the upper atmosphere. ∎ higher in position or status: the upper end of the social scale. 2. situated on higher ground. ∎ situated to the north: [in place names] Upper California. 3. Geol. & Archaeol. denoting a younger (and hence usually shallower) part of a stratigraphic division or archaeological deposit or the period in which it was formed or deposited: the Upper Paleolithic age.• n. 1. the part of a boot or shoe above the sole. 2. (uppers) upper dentures or teeth.PHRASES: have (or gain) the upper hand have or gain advantage or control over someone or something.up·per2 • n. (usu. uppers) inf. a stimulating drug, esp. amphetamine.