Hello, The word "combinator" is used several times in the Haskell community. e.g. parser combinator, combinator library etc. Is it exactly the same term that is used in the "combinatory logic" ? A combinator is a higher-order function that uses *only function application* and earlier defined combinators to define a result from its arguments. [1] It seems, the term combinator as in, say, "parser combinator", doesn't have much to do with the "*only function application*" requirement of the "combinatory logic", per se. If the above observation holds, is the term combinator as used in the Haskell community, properly defined? In other words: Where can I find a formal and precise definition of the term "combinator", as a term used by the Haskell community to describe "something"? Ref: http://en.wikipedia.org/wiki/Combinatory_logic Thanks and regards, -Damodar Kulkarni