The extension language of JamesGosling's implementation (Unipress) of the EmacsEditor. The name is presumably a pun on MacLisp, the extension (and implementation) language of MulticsEmacs.   

http://www.jwz.org/doc/emacs-timeline.html gives a family tree of Emacsen.

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''Oh, I was expecting the imperative form, here!''

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Contributors: DonaldFisk