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Interlisp is a family of programming languages and environments for the creation and use of Lisp programs. Developed in the 1970s at Bolt, Beranek, and Newman (BBN), Interlisp was designed to be user-friendly with an emphasis on interactive development. The language includes features like incremental compilation, object-oriented programming facilities with metafunctions, windows-based graphics systems, and direct support for iterative development through its advanced debugging tools. This adaptability contributed to its usage in artificial intelligence research during the 1980s before being largely replaced by other Lisp variants such as Common Lisp.