Extensible language
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An extensible language is any high-level language that allows its user to modify or enrich its syntax in such a way that a person that does not know the base code cannot tell the customized content from the original. See Extensible programming.
Examples of extensible languages are: lisp, forth, Ada 95, Ada 2005 and C++.
Sources:
Reilly, Edwin D. (2003). Milestones in Computer Science and Information Technology. Greenwood Prenn. pp. pp. 95. ISBN 1-57356-521-0. {{cite book}}
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