Русско-англо-русский юридический словарь

essential term (of a contract) – a provision required for a contract to exist. The client must give informed consent in writing to both the essential terms of the transaction and the lawyer's role in it. (translegal.com)

Only an adult of majority age, with fully informed consent, can agree to needless and permanent body modification. (The Independent)

Provider group medical directors and staff gave informed consent and participated voluntarily on condition of confidentiality. (BMC Health Services Research)