The term "omnibus" refers to a single, large vehicle designed to carry a large number of passengers. The word comes from the Latin phrase "omni bus," which translates to "for all." In its original context, it referred to a type of horse-drawn carriage that was used for public transportation in 19th century Europe. Today, however, the term is often used more broadly to refer to any large or comprehensive collection of things, such as an omnibus bill in politics, which includes multiple pieces of legislation in a single piece of legislation.