(a) To follow or employ (a course of action, mode of behavior, etc.); (b) to do, act; (c) to set oneself (to do sth.), undertake; (d) to learn by repeated performance.

(a) To carry on a profession, esp. medicine; also practice seamanship [quot.: Libel EP]; ~ in, practice (medicine); ~ on, practice law according to the example of (sb.); (b) to carry on (a profession); (c) to perform music; (d) to perform practical work.

(a) To use (sth.), employ; put (a statute) into effect; also, observe (a religious day); (b) to accomplish (sth.), bring about; (c) to inflict (tortures).