What is the antonym of register? [duplicate]

Possible Duplicate:
“Unregister” vs “Deregister”

I'm just wondering what the consensus would be on the antonym of register. The intended use of the word is for a website. Users can register for the site, and should they desire, they can also "unregister".

Can you list a set of words that would fit the problem domain?


Solution 1:

There are several words including "cancel", "eradicate", "rescind", but I think the most relevant word is:

Deregister

Taken from here