official
UK: əˈfɪʃ(ə)l | US: əˈfɪʃ(ə)l
adj. relating to an authority or public body; formal or authorized
n. a person holding a position of authority in an organization
The word "official" traces back to Latin officium (duty/service), combining ob- (toward) and facere (to do/make). Over time, officium evolved into Old French official, referring to ecclesiastical or governmental roles. The suffix -ial (from Latin -ialis) denotes relational adjectives. Thus, "official" literally means "pertaining to duty/service," reflecting its modern sense of formal authority.
The official announcement will be made tomorrow.
She is an official representative of the company.
The document requires an official signature.
He attended the event in an official capacity.
The government released an official statement on the policy.