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1. A bound variable or formal argument in a function definition is replaced by the actual argument when the function is applied. In the lambda abstraction

\ x . Mx is the bound variable. However, x is a free variable of the term M when M is considered on its own. M is the scope of the binding of x.

2. In logic a bound variable is a quantified variable. See quantifier.

Nearby terms: boundary value analysis « bounded « boundedly complete « **bound variable** » bournebasic » Bourne shell » boustrophedonic

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