No, this isn't what the Wikipedia article says. To quote: In programming languages, closures (also lexical closures or function closures) are a techniq

No, this isn't what the Wikipedia article says. To quote: In programming languages, closures (also lexical closures or function closures) are a technique for implementing lexically scoped name binding in languages with first- class functions. which is the same definition that wingo is using. Stack allocation is another technique for implementing lexical scope, if the relevant bindings are still on the stack.