additional

"Additional" is a straightforward adjective with essentially one core meaning, but it appears in so many everyday situations that it is worth understanding well.

1adjectiveextra / more than what already exists

When something is 'additional', it comes on top of what is already there. Think of it as 'one more' or 'extra'. If you already have two bags and someone gives you an additional bag, now you have three.

everyday language · Modern, widely used

The teacher gave us additional homework because we finished early.

There is an additional charge of $5 if you pay by credit card.

We need additional time to complete the project.

2adjectivesupplementary (formal contexts)

In more formal writing — like business emails, reports, or legal documents — 'additional' is used to introduce information or resources that support or extend what has already been said. It signals that something is being added to what already exists.

business / formal writing · Modern, widely used in formal contexts

Please refer to the additional documents attached to this email.

The report includes additional evidence to support the main argument.

Additional funding was approved by the board of directors.