1 to repeat an activity regularly so that you become better at it: How many hours a day do you practice the piano? - practice doing sth Practice putting up your tent a few times before going camping.
2 to do something regularly or in a particular way: The early settlers seem to have practiced farming.
3 to perform the activities and duties of your religion: She practices Catholicism.
4 to work in a particular profession, especially in the medical or legal profession: She lives in Seattle, where she practices law - He completed his medical training but has never practiced.