1. A surgical procedure or medical intervention performed with the patient's informed consent and without coercion
The patient consented to a voluntary operation to remove the benign tumor.
O paciente consentiu com uma operação voluntária para remover o tumor benigno.
2. Any action or procedure undertaken willingly and by choice rather than by obligation or necessity
The company undertook a voluntary operation to clean up the environmental damage.
A empresa realizou uma operação voluntária para limpar os danos ambientais.
3. In legal and administrative contexts, a procedure initiated at the request of a party without legal obligation
The voluntary operation allowed the defendant to settle the matter without litigation.
A operação voluntária permitiu que o réu resolvesse a questão sem litígio.