As used in this chapter
"action" means any civil action or proceeding brought in or appealed to any court which is subject to these rules;
"association" means an unincorporated association conducting any business or engaging in any activity of any nature whether for profit or otherwise under a common name, but does not mean a partnership as defined in Rule 2126 or a corporation or similar entity as defined in Rule 2176.
231 Pa. Code r. 2151