(chiefly business) A well-defined procedure that is known to produce near-optimum results.

(chemistry) The study of ancient alchemy using the knowledge and techniques of modern chemistry in order to advance the understanding of the history of chemistry.

the usual procedure followed in business, or a particular business.

(film) A special effect produced physically, without computer-generated imagery or other postproduction techniques.

plural of practical effect

(of a person) Diminished in proficiency, especially in exercising a skill, due to disuse or a lack of recent experience.

plural of community of practice

A group of people who share a craft and/or a profession.

(transitive, idiomatic) To make (something) a practical reality.

Commercial activity that is possibly dishonest while not actually being illegal. / (law) A lawyer's unfairly taking advantage of an opposing party's missteps or inexperience to gain an advantage.