upper
adjective
[ ˈʌpə ]
• situated above another part.
• "his upper arm"
• situated on higher ground.
• 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 Palaeolithic age"
upper
noun
• the part of a boot or shoe above the sole.
• "leather uppers"
Origin:
Middle English: from the adjective up + -er2.
upper
noun
• a stimulating drug, especially amphetamine.
Origin:
1960s: from the verb up + -er1.