practic (n.)

late 14c., practike, "practical aspect of doing something, method; practice (as opposed to theory), practical knowledge or experience;" also "an applied science;" from Old French practique "practice, usage" (13c.) and directly from Medieval Latin practica "accomplishment, practical knowledge," ultimately from Greek praktikē "of or pertaining to actions, concerned with action or business"(as opposed to "theoretical"); fem. of praktikos "done; to be done" (see practical).