upper Definition in the Cambridge English Dictionary
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Definition of “upper” - English Dictionary

Definition of "upper" - American English Dictionary

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upperadjective [not gradable]

 us   /ˈʌp·ər/
at a ​higherposition or ​level (than something ​else), or being the ​toppart of something: Our ​companyoccupied the three upper ​floors of the ​building.

uppernoun [C]

 us   /ˈʌp·ər/
the ​toppart of a ​shoe
(Definition of upper from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "upper" - British English Dictionary

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upperadjective [before noun]

uk   /ˈʌp.ər/  us   //
B1 at a ​higherposition or ​level than something ​else, or being the ​toppart of something: The ​office building's upper ​floors were being repainted. If the ​infection is not ​checked it will ​probablyspread to the upper ​body.
Opposite
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uppernoun [C]

uk   /ˈʌp.ər/  us   //

upper noun [C] (SHOE PART)

the ​toppart of a ​shoe that ​covers a person's ​foot and to which the heel and the sole are ​attached: These ​shoes have ​leather uppers and ​syntheticsoles.

upper noun [C] (DRUG)

informal a ​drug that ​causes a ​person taking it to ​feel very ​active and ​excited
Opposite
(Definition of upper from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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