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unofficially
01
in a manner that is not official
02
without approval from a government, organization, or relevant authority
Example
Unofficially, employees were informed about the upcoming changes in company policies.
The information about the new product was leaked unofficially before the official announcement.
The event was celebrated unofficially by a group of enthusiasts before any official ceremony.
The decision to restructure the department was discussed unofficially among the staff.