officially

/əˈfɪʃəli/
adverb
  1. In a way that is formally approved or recognized by an authority.
    • The new law officially takes effect on January 1st.
    • She was officially named the winner of the competition.
    • The school officially opened its new library last week.
  2. Used to emphasize that something is definitely true or has been confirmed.
    • After that long hike, we were officially exhausted.
    • I am officially the worst cook in my family.
    • He officially has the most unusual hobby I've ever heard of.
Antonyms