In spite of being a pedant myself I have a real mental block over this one. I have consulted my dictionary on many occasions and it is frustratingly unclear on the matter. Seeing it written wrongly so often by others just compounds my confusion. Just when I think I have it right I'm thrown inot doubt again.
Do I practise or practice my violin?
Do I run a law practice or a law practise?
And (this is the tricky bugger) - do I indulge in the practice of fellatio or the practise of it? Strictly speaking, neither of the above two categories covers it.
Thanks awfully.