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  ANSI Common Lisp   3 Evaluation and Compilation   3.1 Evaluation

3.1.1 Introduction to Environments

A binding is an association between a name and that which the name denotes. Bindings are established in a lexical environment or a dynamic environment by particular special operators.

An environment is a set of bindings and other information used during evaluation (e.g., to associate meanings with names).

Bindings in an environment are partitioned into namespaces. A single name can simultaneously have more than one associated binding per environment, but can have only one associated binding per namespace.  The Global Environment  Dynamic Environments  Lexical Environments  Environment Objects

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