“Again, consent, which is essential to all contracts, is an actus animi, and is presumed in all cases where the contract is ex facie regular.” John Trayner, Trayner’s Latin Maxims 21–22 (4th ed. 1894).
actus animi
actus animi (ak-t[schwa]s an-[schwa]-mI). [Law Latin] Hist. An act of the mind; an intention. See ANIMUS.