I would like to propose a synonym for the gcd tag. Because a popular the Cocoa technology, Grand Central Dispatch, uses that acronym, the most common use of the gcd tag on Stack Overflow was in that context, even though the wiki excerpt advised against that. As a result, in another Meta discussion, I made a synonym request between gcd and grand-central-dispatch. That was a very unpopular suggestion. Because of the vocal feedback on that suggestion, I (and others) went through Grand Central Dispatch related questions tagged with gcd and retagged them as grand-central-dispatch.
So, I would like to now suggest a new gcd synonym of greatest-common-divisor. While that's not necessarily a synonym that resonates with me personally, I think it's clear that this is more popular than the proposed synonym to grand-central-dispatch. I'd also suggest that we delete the proposed synonym (first proposed Nov 2010) between grand-central-dispatch and gcd.
Leaving gcd without a synonym will only be an ongoing source of confusion. It's short and ambiguous. I think the best way to avoid continual misuse is to define a synonym. Clearly the use of the wiki excerpt was not sufficient.