Origin of the term "functor"

Wikipedia says that the word "functor" is borrowed from work by Carnap on linguistics. Is anyone aware of other roots of category theory that come from linguistics/semiotics? -- D. E. (Steve) Stevenson, PhD, Emeritus Associate Professor, Clemson University "Those that know, do. Those that understand, teach," Aristotle. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]