I would also allow that "conservatism" is a spectrum unto itself. Like "violet" covers portions of the light spectrum - visible and invisible.
But, as noted above, perhaps the commonly accepted range has shifted considerably away from my own. And this is even excepting social issues.
Undoubtedly, conservatism itself is a spectrum - which is why I left the definition as vague as I did, articulating principles rather than specifics. And under my definition of "conservatism", using the government to legislate morality would fall outside of that spectrum, and would instead be part of the statist spectrum.
As for shifting definitions: that is true, and known. In fact, "liberal" and "conservative" have almost completely exchanged definitions over the past half-century.