I was recently having a discussion with a stubborn person to whom I happen to be married and she was suggesting that "next Monday" is the "next Monday that will happen." So if it's Friday, "next Monday" is in three days.
I personally believe that "next Monday" is the Monday that comes after the soonest Monday. The soonest Monday is "this Monday." My recent polls have agreed with me. How do you guys come down on this very important issue?
next Monday is the Monday that comes after the soonest Monday
Sorry Mrs. Brad..this Monday is the upcoming Monday..next Monday is the following Monday.
Bella
I agree with the consensus here, but I get a surprising amount of disagreement on the subject.
Unless it's Tuesday or Wednesday, in which case next Monday could be Monday coming.
I can only please one person per day. Today isn't your day... tomorrow doesn't look good either.
This is a tough one and I can see why it's causing confusion. For me, "next Monday" is the next Monday. The one that comes next. "This Monday" doesn't mean anything much at all to me, as it could mean the Monday in the week you are currently having (which could mean Monday past).
I'll stick to dates! 
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2010 Beach Club Resort
2005 Port Orleans Riverside
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Next Monday = the Monday after this Monday.
Unless it's Tuesday or Wednesday, in which case next Monday could be Monday coming.
Good point. I typically don't use "Next Monday" if it's still a way off, as it could be confusing.