By conceptus cosmicus Kant means concept shared by the whole world, or common to all mankind.
For this reason we ought to call these conceptions, conceptions of comparison (conceptus comparationis).
The Idea is never a conceptus dabilis; it is not an empirically possible conception.
conceptus con·cep·tus (kən-sěp'təs)
n. pl. con·cep·tus·es
The products of conception; that is, the embryo, chorionic sac, placenta, and fetal membranes.