adjective

1. in a place or on a level above another upper lip, upper jaw, upper floor
2. higher in rank, authority, or dignity the upper classes
3. being farther north, farther inland, or at a higher elevation of land the upper St. Lawrence
4. Archaeol., Geol. more recent; later: used of a division of a period [Upper Cambrian, Upper Paleolithic]

Etymology: ME, compar. of up, up

noun

1. the part of a shoe or boot above the sole
2. ☆ Informal an upper berth, as in a Pullman car
3. Informal the upper teeth or dentures
4. Slang any drug containing a stimulant; esp., an amphetamine