Variously located in logic, linguistics, philosophy and communication research, the study of how and what a sign, symbol,message or system means to an observer.

The study of the meaning of words of, of their use in languages and the adequacy of this use for the representation of reality and as a means of communication.

Semantics is that part of semiotics which is restricted to the spoken or written signs.

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Principia Cybernetica
International Encyclopedia of Systems & Cybernetics