Definition from macmillandictionary.com
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My brother and I always had separate rooms.
My parents have separate bank accounts.
They’re not divorced but they lead completely separate lives (=do not do things together).
Clients’ funds should be kept separate from the firm’s own money.
Each apartment has its own separate entrance.
Answer each question on a separate sheet of paper.
Police have killed seven guerrillas in three separate incidents this week.
That’s an entirely separate matter.
They arrived at the party separately.