Questions about the exact nature of linguistic as opposed to non-linguistic knowledge have been asked for as long as humans have studied language, be it as linguists, philosophers, psychologists, language teachers, semioticians or cognitive scientists. This distinction has been maintained and defended by some, attacked and abandoned by others. Through specially commissioned papers for this, the fifth volume in the Current Research in Semantics/Pragmatics Interface series, contributors argue both for and against the distinction between lexical knowledge and encyclopedic knowledge and debate how it should be drawn.