omnibus (n.)

1829, "long-bodied, four-wheeled public vehicle with seats for passengers," from French (voiture) omnibus "(carriage) for all, common (conveyance)," from Latin omnibus "for all," dative plural of omnis "all" (see omni-). Introduced by Jacques Lafitte in Paris in 1819 or '20, used in London from 1829.

As an adjective, in reference to legislation, "designed to cover many different cases, embracing numerous distinct objects," recorded from 1835; in U.S., used especially of the Compromise of 1850. Noun meaning "man or boy who assists a waiter at a restaurant" is attested from 1888 (compare busboy).

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Definitions of omnibus from WordNet
omnibus (n.)
an anthology of articles on a related subject or an anthology of the works of a single author;
omnibus (n.)
a vehicle carrying many passengers; used for public transport;
Synonyms: bus / autobus / coach / charabanc / double-decker / jitney / motorbus / motorcoach / passenger vehicle
omnibus (adj.)
providing for many things at once;
an omnibus law