adj.1. Higher in place, position, or rank: the upper bunk; the upper half of the class.
2. a. Situated on higher ground: upper regions.
b. Lying farther inland: the upper Nile.
c. Northern: the upper Midwest.
3. Upper Geology & Archaeology Of, relating to, or being a later division of the period named.
4. Denoting the smaller and usually less broadly representative house of a bicameral legislature.
n.1. The part of a shoe or boot above the sole.
2. Informal An upper berth.
3. uppers Informal The upper teeth or a set of upper dentures.
4. Slang a. A drug, especially an amphetamine, used as a stimulant.
b. An exhilarating or euphoric experience.