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Logic (of a variable) occurring within the scope of a quantifier that indicates the degree of generality of the open sentence in which the variable occurs: in (x) (Fx → bxy), x is bound and y is free
a. a number which is greater than all the members of a set of numbers (an upper bound), or less than all its members (a lower bound)
b. more generally, an element of an ordered set that has the same ordering relation to all the members of a given subset
c. whence, an estimate of the extent of some set