a book containing reprints of a number of works, usu by one author
a television or radio programme consisting of two or more programmes, usu episodes of a series, orig broadcast separately
(used before a noun) being an omnibus
an omnibus edition of the works of Jane Austen
formal, dated a bus
The handbag … seems to be mine. Yes, here is the injury it received through the upsetting of a Gower Street omnibus in younger and happier days — Oscar Wilde
[French omnibus bus, from Latin omnibus for all, dative pl of omnis all]