Definition of upper adjective from the Oxford Advanced Learner's Dictionary

      

    upper

     adjective
    adjective
    BrE BrE//ˈʌpə(r)//
     
    ; NAmE NAmE//ˈʌpər//
     
    [only before noun]
     
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  1. 1  located above something else, especially something of the same type or the other of a pair the upper lip the upper deck
  2. 2  at or near the top of something the upper arm the upper slopes of the mountain a member of the upper middle class salaries at the upper end of the pay scale There is an upper limit of £20 000 spent on any one project.
  3. 3(of a place) located away from the coast, on high ground or towards the north of an area the upper reaches of the river
  4. opposite lower1
    Word Originadjective Middle English: from the adjective up + -er.Idioms
    gain, get, have, etc. the upper hand
     
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    to get an advantage over somebody so that you are in control of a particular situation
    (keep) a stiff upper lip
     
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    to keep calm and hide your feelings when you are in pain or in a difficult situation He was taught to keep a stiff upper lip and never to cry in public. Their reaction contrasts sharply with the stiff upper lip of the English.
See the Oxford Advanced American Dictionary entry: upper