资料来源 : WordNet®

upper bound
     n : (mathematics) a number equal to or greater than any other
         number in a given set

资料来源 : Free On-Line Dictionary of Computing

upper bound
     
        An upper bound of two elements x and y under some {relation}
        <= is an element z such that x <= z and y <= z.
     
        ("<=" is written in {LaTeX} as {\sqsubseteq}).
     
        See also {least upper bound}.
     
        (1995-02-15)