Definitions
Terms
can be defined only by means of other terms, whose meanings are
presupposed and must be antecedently understood if the definitions are
to explain then meanings of the terms being defined. If all terms or
symbols of a system are to be defined _within the system_, there must be
either infinite sequences of definitions, or circular definitions.
Circular definitions are obviously worthless as explanations, and
infinite sequences of definitions are worthless also, for no term will
really be explained until the end is reached, and infinite sequence has
no end.
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