official
adjectiveUK /əˈfɪʃ.əl/
US /əˈfɪʃ.əl/
Approved by a person in charge.
The official rules say we must wear helmets.
RELATED WORDS
OTHER MEANINGS
2. A person who has an important job in a government or organization.
The official opened the new park.
3. Said or done in a public and formal way.
She made an official announcement about the trip.
4. Related to a position of power or duty.
He visited the school in an official capacity.