Just for the record, when used as a noun, *practice* should be spelled with -ice at the end

Practise (with an s ) is the UK verb form; it is used with c in the US.

E.g. the Concise Oxford Dictionary gives:

practice
· n.
1 the actual application or use of a plan or method, as opposed to the theories relating to it.
2 the customary or expected procedure or way of doing something.
3 the practising of a profession. Ø the business or premises of a doctor or lawyer.
4 the action or process of practising.
· v. US spelling of practise.
– PHRASES in (or out of) practice having (or not having) practised an activity or skill on a regular basis.
– ORIGIN ME: from practise, on the pattern of pairs such as advise, advice.
____________________________________________
Under practise (with an s ) COD gives:

practise (US practice)
· v.
1 perform (an activity) or exercise (a skill) repeatedly or regularly in order to acquire, maintain, or improve proficiency in it.
2 carry out or perform (an activity or custom) habitually or regularly.
3 be engaged in (a particular profession).
4 observe the teaching and rules of (a particular religion).
– DERIVATIVES practised adj. practiser n.
– ORIGIN ME: from OFr. practiser or med. L. practizare, alt. of practicare ‘perform, carry out’, from practica ‘practice’, from Gk praktikU, from praktikos (see practical).