B-1, r. 3.1 - Code of Professional Conduct of Lawyers

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3. In this code:
(1)  “client” includes any person or organization, as the case may be, to whom the lawyer renders or undertakes to render professional services; this term also means a person who consults a lawyer and has reasonable grounds to believe that a lawyer-client relationship exists;
(2)  “firm” includes any person who engages in his professional activities or any group of persons comprised of several lawyers or of at least one lawyer and one other professional referred to in Schedule A of the Regulation respecting the practice of the profession of advocate within a limited liability partnership or joint-stock company and in multidisciplinarity (chapter B-1, r. 9) who engage in their professional activities together or represent themselves as doing so;
(3)  “mandate” includes any contract pursuant to which a lawyer acts on behalf of a client;
(4)  “tribunal” includes a court of justice as well as any person or other body that exercises an adjudicative function.
O.C. 129-2015, s. 3.