noun
functional language
A programming language that emphasizes a functional programming style, such as Haskell or Lisp. Domain-specific computing term.
Haskellは代表的な関数形言語の一つです。
Haskell is one of the representative functional languages.
More common variant with 型 instead of 形. Same meaning; 関数型言語 is the usual term.
Compound of 関数 (function) + 形 (type/form) + 言語 (language). A direct calque from English 'functional language'.