Omnibus is a Latin word meaning "for all (people)" and has 3 main meanings in standard English:

• A vehicle for transporting large numbers of people. See bus.

• A book or video collecting two or more previous works by the same author or director. See omnibus (media) .

• For a soap opera or similar broadcast it is a compilation of daily episodes that is usually broadcast during the following weekend. See omnibus (broadcast)

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Note: Omnibus had no plural in Latin, because it was already a plural word. In English, its plural is "omnibuses", not "omnibi", which is a solecism.