Unofficial | Mean of unofficial in English Dictionary

/ˌʌnəˈfɪʃəl/

• not official: such as
• not formally chosen by an official decision or vote
1. The song is the college's unofficial anthem.
2. She was the group's unofficial leader.
• not done or made in a formal way by someone in a position of authority
1. Unofficial estimates of the number of people killed in the earthquake range from 3,000 to 5,000.
2. I am including an unofficial translation of the speech.

• not having the authority to make a statement, decision, etc.
1. According to unofficial sources, the decision will be appealed.
• not done in a public and formal way as part of someone's job
1. The mayor paid an unofficial visit to the hospital.