Upper means higher than the other part, or nearer the top. The one above.
It goes in front of a noun and has no comparative form, so an upper floor, the upper arm and the upper deck are all standard. It marks a great many pairs, since upper and lower divide bodies, buildings, rivers and chambers of parliament. There is a phrase about advantage in having the upper hand. The noun upper means the top part of a shoe above the sole.
1adjectiveupperSituated above the other part, or nearer the top.
“The office is on the upper floor.”
Middle English
upper
English, today
upper
From Middle English upper, from enm + up. Inherited from Middle English upper. by surface analysis, up + -er.
Etymology from Wiktionary, CC BY-SA