notarial actglossary / NOTARIAL ACT notarial act. An official function of a notary public, such as placing a seal on an affidavit. See NOTARY PUBLIC. [Cases: Notaries6. C.J.S. Notaries §§ 11, 15, 17.] 词条贡献者 译员黎川,在一家顶尖澳洲律师事务所的上海办公室担任全职法律翻译,擅长翻译涉及工业与制造业领域的法律文件。