Black's Law Dictionary (2nd edition)dictionaries

Negotiorum Gestor

Lat. In the civil law. A transacter or manager of busi-ness; a person voluntarily constituting him-self ageut for another; one who, without any mandate or authority, assumes to take charge of an affair or concern for another person, in the latter’s absence, but for his interest

Source: Black’s Law Dictionary 2nd Ed (1910)