1. Frequently repeated or customary action; habitual performance; a succession of acts of a similar kind; usage; habit; custom; as, the practice of rising early; the practice of making regular entries of accounts; the practice of daily exercise.
4. Application of science to the wants of men; the exercise of any profession; professional business; as, the practice of medicine or law; a large or lucrative practice. Practice is exercise of an art, or the application of a science in life, which application is itself an art. (Sir W. Hamilton)
7. To perform certain acts frequently or customarily, either for instruction, profit, or amusement; as, to practice with the broadsword or with the rifle; to practice on the piano. Performance of an act one or more times, with a view to its fixation or improvement; any performance of an act or behaviour that leads to learning.
9. To apply theoretical science or knowledge, especially. By way of experiment; to exercise or pursue an employment or profession, esp. That of medicine or of law. [I am] little inclined to practice on others, and as little that others should practice on me. (Sir W. Temple)
Origin: OE. Praktike, practique, F. Pratique, formerly also, practique, LL. Practica, fr. Gr, fr. Practical. See Practical, and cf. Pratique, Pretty.