Lisp

Lisp was one of the first programming languages to attempt to be a functional programming language.

Computational Class

Turing-complete

Programming Paradigms

Defined by

http://www.lispworks.com/documentation/HyperSpec/Front/index.htm

Commentary

I'm one of those people who wonders why anyone bothers programming in, talking about, or thinking about Lisp anymore, since Scheme exists. That's just me, though.