QUASI TRADITION, civil law. A term used to designate that a person is in the use of the property of another, which the latter suffers and does not oppose. Lec. Elein. Sec. 396. It also signifies the act by which the right of property is ceded in a thing to a person who is in possession of it; as, if I loan a boat to Paul, and deliver it to him, and afterwards I sell him the boat, it is not requisite that he should deliver the boat to me, to be again delivered to him there is a quasi tradition or delivery.