Definition from macmillandictionary.com
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We ought to be able to complete the work in a single day.
The envelope contained a single sheet of paper.
Please state whether you are single, married, or divorced.
Are there no attractive single men left?
The room has two single beds.
There is a supplement to pay for a single room.
Do we have to count every single penny we spend?
Drugs are the single biggest cause of crime here.
This is the biggest single issue facing older people.
We’re paying a single rate for all workers, experienced or inexperienced.
I’d like a single ticket to Dover.