praxis (n.)

1580s, "practice or discipline for a specific purpose," from Medieval Latin praxis "practice, exercise, action" (mid-13c., opposite of theory), from Greek praxis "practice, action, doing," from stem of prassein, prattein "to do, to act" (see practical). From 1610s as "a collection of examples for practice." In 20c. given a particular sense in Marxist jargon.