Duhaime's Law Dictionary Pro Socio Definition: Latin: on behalf of a partnership. To act for a partnership. A court application stated to be pro socio is made on behalf of a partnership. Used in Justinian's Institutes of 533 (III, xxv, 9) as follows: "It has been asked whether one partner is liable to another by the partnership action (pro socio) only for his fraud, like one who allows a thing to be deposited with him, or also for negligence, i.e. in respect of his inertia and lack of care: the view prevailed that he is liable also for negligence. But negligence, in this context, is not directed to the highest standard of care: it is enough that the partner shows, in partnership matters, such care as he would show in his own affairs. For one who takes a partner who is deficient in care, should complain of himself (i.e. attribute the defect to himself)." REFERENCES: Duhaime, Lloyd, Legal Definition of Partnership Categories & Topics: Dictionary of Latin Law Terms Duhaime's Company, Associations and Commercial Law Dictionary Always looking up definitions? Save time with our search provider (modern browsers only) If you find an error or omission in Duhaime's Law Dictionary, or if you have suggestion for a legal term, we'd love to hear from you!