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Preview: What is language? This question seems to be as fundamental and inescapable for philosophical reflection as it is paradoxical, if not abysmal. It is fundamental since philosophy cannot and should not escape questions concerning its own basic medium, the element of its self-realization or the means of expression of its conceptualized claims and propositions. It is paradoxical since it is essentially self-referential. There is no possibility to pose it from without, and every attempt to answer it by non-linguistic means seems questionable. This observation, as trivial as it is, leads us to two general points which are more complex.