0 extra:
There will be an extra charge for any additional passengers.
1 put with something else to increase the number or amount or to make it more important:
2 extra:
3 resulting in a reduction in the amount of carbon dioxide gas that is released into the environment, which would not have happened without trading carbon credits:
The doctor has made an initial diagnosis, but there'll be an additional examination by a specialist.
They looked to the government for additional support.
An additional power switch for the radio is handily located next to the steering wheel.
An additional grant has enabled the team to push forward with research plans.
The education director is persevering in his attempt to obtain additional funding for the school.
Paths permitting additional direct effects are also included as part of the model.
Additional references were identified through searching bibliographies of related publications and through contact with relevant topic experts and industry.
For female pupils in this group this is slightly less important, but "fitting in to the group" is an additional factor for them.