The definition of a loaner is a person who permits something to be borrowed, or is something that is being borrowed temporarily.noun
- If you let a friend borrow your car, this is an example of when you are a loaner.
- A car that the dealership allows you to use while your own vehicle is being serviced is an example of a loaner.
- a person who loans something
- an automobile, TV, typewriter, etc. lent in place of one left for repair
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