eirce's philosophy, anyway, and the traditions that he extends:

1.  The paired features of extension and intension, as they apply to signs,
    for example, terms and concepts, are not in dichotomy with each other,
    that is, not in the sense that a sign must always be in positive
    possession of either extension or intension, but never both.
    These are aspects, axes, dimensions, directions, modes, or
    senses of being for a sign, and most signs are specified
    in both of these dimensions.  Inde