stratagem

A "stratagem" is any clever scheme - sometimes one that's part of an overall "strategy" (i.e., a carefully worked out plan of action). Clearly, we no longer limit ourselves to the original military sense of "stratagem" as 15th-century users of the term did. The military meaning can be traced back to the word's Greek ancestor strategema, which is itself based on strategein, meaning "to act as a general." "Strategein" in turn comes from "strategos" ("general"), which comes from "stratos" ("army") and "agein" ("to lead"). "Strategos" is an ancestor of "strategy" as well.