Versine is a mathematical term that refers to the complementary cosine of an angle in a right triangle. It is a term that is seldom used outside of the realms of math and engineering. However, there are many synonyms that can be used in place of versine. These include circular function, complementary sine, cofunction, inverse sine, and sine complement. All of these terms can be used to describe the same mathematical concept as versine, but they are more widely recognized and easier for the general public to understand. Whether you are a math expert or simply looking for a more common alternative, these synonyms for versine are sure to come in handy.