Abstract
Charles S. Peirce (†1914) is often referred to as the founder of contemporary semiotics. Peirce provided the community of inquiry with a very convincing explanation of what a sign is. Peirce's definition of the sign bears a striking resemblance to that proposed in the 1606 volume of the CJC, the Coimbra Jesuit Course, authored by Sebastião do Couto (†1639). The community of inquiry holds the belief that Peirce drew from the writings of Couto to arrive at his triadic conception of the sign. Could it be that the effect of the CJC on Peirce is restricted to the definition of the sign? What can anyone say so far on the Peirce-CJC relation? Our ultimate purpose here is to provide a contribution to settling such doubts.