Earlier quoted context omitted.
Excel is a close contender. It's still the world's most popular programming language. It incorporates a zeroth order functional language (the spreadsheet).
Off-topic, but what's a zeroth order functional language? What are the other orders (something reqiring lambdas, closures, etc)? Google and Wikipedia didn't help.
A higher-order functional language allows higher order functions like map, filter and foldl (functions on functions). A first order language allows to define functions, but not on other functions. And a zeroth order language does not allow you to define functions (or name anything) as far as I figure.