1. In a formal manner; according to established rules, customs, or procedures
The president formally announced the new policy.
O presidente anunciou formalmente a nova política.
2. With official or ceremonial character; in an official capacity
They were formally introduced at the gala.
Foram formalmente apresentados na gala.
3. Strictly according to the form or structure; technically
Formally speaking, the contract is still valid.
Formalmente falando, o contrato ainda é válido.