adjective / noun / adverb
extra
EK-struh/ˈekstrə/
Beyond the usual or expected amount.
Two extra eggs sit beside the full six-slot carton.

Etymology
Latin extra supplies the idea of being outside or beyond a boundary. The adjective probably arose by shortening extraordinary, “outside the usual order,” giving extra its sense of exceeding what is usual or expected.
In context
when the government's total income from taxes and other sources is more than what it spends during a specific period, usually a year. This means the government ends up with extra money creating a positive balance.
More examples
- Breakfast is an extra, not part of the room price.
- I check the address extra carefully before mailing the package.
- The newspaper prints an extra to report the president's resignation.
- His glittery suit is a little extra for a backyard barbecue.
Forms
extra · extras
Similar words
- additional
- Means added to what exists, without suggesting an excess.
- surplus
- Specifically describes an amount left over after needs are met.