an anthology of articles on a related subject or an anthology of the works of a single author
"The library donated its entire collection of poetry, including a new omnibus that gathered all of Maya Angelou's novels and essays into one massive volume."
a vehicle carrying many passengers; used for public transport
"he always rode the bus to work"
A vehicle set up to carry many people (now usually called a bus).
"The ancient Romans used an omnibus to transport large groups of citizens across the city."
To combine (legislative bills, etc.) into a single package.
"The senator proposed an omnibus bill to bundle all twelve unrelated spending measures into one final vote for the entire committee."
Containing multiple items.
"The teacher handed out an omnibus worksheet that included grammar exercises, reading comprehension questions, and a math quiz all on one page."
The word comes from the French phrase omnibus, which originally meant a carriage for everyone. This French term was borrowed directly from the Latin word omnibus, meaning "for all."