I. ˈäm-ni-(ˌ)bəs noun
Etymology: French, from Latin, for all, dative plural of omnis
Date: 1829
1. : a usually automotive public vehicle designed to carry a large number of passengers : bus
2. : a book containing reprints of a number of works
II. adjective
Date: 1842
1. : of, relating to, or providing for many things at once
2. : containing or including many items
an omnibus bill