+**Def** (short for "define" or "definition") initiates the creation of a named code block or entity. It signals the explicit [Definition](/wiki/definition) of constructs like a [Function](/wiki/function), establishing structure within a program. This keyword is fundamental to declaring new elements for computational use.
+## See also
+- [Keyword](/wiki/keyword)
+- [Variable](/wiki/variable)
+- [Programming](/wiki/programming)
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