Webster's English Dictionary

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upper

1. up.per \'*p-*r\ aj 1: higher in physical position, rank, or order  2: 
   constituting the branch of a bicameral legislature that is usu. smaller  
   and more restricted in membership and possesses greater traditional 
   prestige than the lower house 3a: constituting a stratum relatively near 
   the earth's surface  cap  3b: being a later epoch or series of the period 
   or series named {Uppe r Carboniferous} 4: EARLIER  5: NORTHERN 
2. upper n : one that is upper : as  : the parts of a shoe or boot above 
   the sole  : an upper tooth or denture  : an upper berth