The Collaborative International Dictionary of English v.0.48:

Upper \Up"per\, a.; comp. of Up.
   Being further up, literally or figuratively; higher in place,
   position, rank, dignity, or the like; superior; as, the upper
   lip; the upper side of a thing; the upper house of a
   legislature.
   [1913 Webster]

   The upper hand, the superiority; the advantage. See To
      have the upper hand, under Hand. --Jowett (Thucyd.).

   Upper Bench (Eng. Hist.), the name of the highest court of
      common law (formerly King's Bench) during the
      Commonwealth.

   Upper case, the top one of a pair of compositor's cases.
      See the Note under 1st Case, n., 3.

   Upper covert (Zool.), one of the coverts situated above the
      bases of the tail quills.

   Upper deck (Naut.), the topmost deck of any vessel; the
      spar deck.

   Upper leather, the leather for the vamps and quarters of
      shoes.

   Upper strake (Naut.), the strake next to the deck, usually
      of hard wood, and heavier than the other strakes.

   Upper ten thousand, or (abbreviated) Upper ten, the ten
      thousand, more or less, who are highest in position or
      wealth; the upper class; the aristocracy. [Colloq.]

   Upper topsail (Naut.), the upper half of a double topsail.


   Upper works (Naut.), all those parts of the hull of a
      vessel that are properly above water.

   Upper world.
   (a) The atmosphere.
   (b) Heaven.
   (c) This world; the earth; -- in distinction from the
       underworld.
       [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Upper \Up"per\, n.
   The upper leather for a shoe; a vamp.
   [1913 Webster]

WordNet (r) 3.0 (2006):

upper
    adj 1: the topmost one of two
    2: higher in place or position; "the upper bunk"; "in the upper
       center of the picture"; "the upper stories"
    3: superior in rank or accomplishment; "the upper half of the
       class"
    n 1: the higher of two berths [syn: upper berth, upper]
    2: piece of leather or synthetic material that forms the part of
       a shoe or boot above the sole that encases the foot; "Uppers
       come in many styles"
    3: a central nervous system stimulant that increases energy and
       decreases appetite; used to treat narcolepsy and some forms
       of depression [syn: amphetamine, pep pill, upper,
       speed]

Moby Thesaurus II by Grady Ward, 1.0:

88 Moby Thesaurus words for "upper":
   Benzedrine, Benzedrine pill, C, Dexamyl, Dexamyl pill, Dexedrine,
   Dexedrine pill, Methedrine, a cut above, above, advantage, ahead,
   amphetamine, amphetamine sulfate, aristocrats, ascendancy,
   ascendant, authority, better, blue bloods, broke, capping, chosen,
   cocaine, coke, command, control, crystal, destitute,
   dextroamphetamine sulfate, distinguished, dominance, eclipsing,
   edge, elite, eminent, exceeding, excellent, excelling, finer,
   football, greater, heart, higher, highest, in ascendancy,
   in the ascendant, indigent, jolly bean, later, loftier, major,
   marked, methamphetamine hydrochloride, northern, of choice,
   one up on, outstanding, over, pep pill, poor, poverty-stricken,
   power, purple heart, rare, rivaling, snow, speed, stimulant, super,
   superior, superiority, supremacy, surpassing, sway, topmost,
   topping, transcendent, transcendental, transcending, upland,
   upmost, upper case, upper class, upper crust, upper hand,
   uppermost, wealthy