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This is an extra chair if you need it.

Being more than what is usual or necessary.
She bought an extra ticket.
He needs extra help with homework.
We have extra food for everyone.
extra charge
extra time
extra effort
additional
supplementary
surplus
This is an extra large pizza.

To a greater extent than is usual or expected.
She worked extra hard today.
He ran extra fast to win.
The soup was extra salty.
extra special
extra careful
extra good
very
highly
remarkably