We think of "secularization" as a process that can occur anywhere (and for some people, is occurring everywhere). And we think of secularist regimes as options for any country, whether they are adopted or not. And certainly, these words crop up everywhere. But do they really mean the same thing? Are there not, rather, subtle differences, which can bedevil cross-cultural discussions of these matters? This paper explores the important historical polysemy found in the evolution of the term "secular".