Usage Note
Consentimiento is the standard legal and ethical term for consent, widely used in medical (consentimiento informado — informed consent), legal, and personal contexts. It derives from the verb consentir. Don't confuse it with consenso (consensus, a broader agreement among a group) — consentimiento is always about one party giving permission.
Examples
"El médico obtuvo el consentimiento del paciente."
Natural Translation
The doctor obtained the patient's consent.

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