With reference to the authorized signing of documents by one person on behalf of another: by the agency of an official agent or attorney, by proxy; by the agency of; also in extended use. Also as adjective Compare "per pro", "procuration".
per procurationem/pər ˌprɒkjʊreɪtɪˈəʊnɛm/ /pər ˌprɒkjʊreɪʃɪˈəʊnɛm/
Early 19th century. In α form from per + procuration.