Real Dictionary

practice
countable noun: You can refer to something that people do regularly as a practice.
variable noun: Practice means doing something regularly in order to be able to do it better. A practice is one of these periods of doing something.

practice in American English
to do or engage in frequently or usually; make a habit or custom of
intransitive verb: to do something habitually or as a practice
noun: habitual or customary performance; operation
transitive verb: to perform or do habitually or usually

practice in British English
noun: a usual or customary action or proceeding
verb