To perform an activity or exercise repeatedly or regularly in order to improve or maintain one's proficiency. She practises the piano every day to prepare for the concert.
To carry out or perform a particular activity, method, or custom habitually or regularly. He practises meditation every morning to start his day with a clear mind.
To work as a professional, especially in law or medicine. After passing the bar exam, she began to practise law in a prestigious firm.
To carry out, perpetrate, or perform (an action, especially something deceitful or wrongful). The con artist practised a cruel deception on his elderly victims.