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SYNTAX: A relation in which the reference of a certain element is dependent on the reference of another element. See Binding theory, Bind.

SEMANTICS: The relation obtaining between a quantifier All(v) or Exists(v) and the occurrences of the variable v in its scope:

(i)      All(v)[ ... v ... ]
(ii)  Exists(v)[ ... v ... ]
In the following formula only the first occurrence of x is bound by All but not the second (which is not in the scope of All):
(iii) All(x)[P(x) -> Q(y)] & R(x)
The first occurrence of x is called a bound variable, the second occurrence is called a free variable.
LIT. Gamut, L.T.F. (1991)