practice, practise Definition

practice
noun

1. The process of carrying something out.

Example: put ideas into practice
Thesaurus: action use, operation.
2. A habit, activity, procedure or custom

Example: Don't make a practice of it!
Thesaurus: custom, tradition, convention, habit, routine, way, method, way, procedure, wont, mode, modus operandi, manner, fashion, policy.
3. Repeated exercise to improve technique in an art or sport, etc.
4. The business or clientele of a doctor, dentist, lawyer, etc.

Idiom: be in practice (be out of practice)

To have maintained, or failed to maintain, one's skill in an art or sport, etc.

Etymology: 16c: from practise.

Info:

In British English, practice is the spelling of the noun, and practise the verb. American English uses practice for both.