1. in a formal or authorized manner; according to rules or regulations
2. publicly announced or declared

Examples

• The new policy was officially announced yesterday.
• She officially became a citizen last month.
• The store officially opens at 9 AM.
• He was officially appointed as the new manager.
• The results haven’t been officially confirmed yet.
• The building was officially dedicated in 1995.
• They officially launched the product at the conference.