Ok, not to get too picky, but I will...RRO further clarifies the 2/3 definition by stipulating it's 2/3 of the members present AND voting (provided there's quorum like Tim said). If a member choses to abstain (something I've seen when people are reluctant to take sides on a contentious issue), her action is considered a non-vote. So the fact that she's there at the meeting doesn't enter into the 2/3 calculation. It's the number of votes cast and abstentions don't count as votes.
There are more nuances to voting like majority, plurality, what is quorum if not specified in your bylaws, etc. that is covered by Roberts Rules. If you are anticipating a delicate or controversial issue, you might want to get your hands on a couple of books about Roberts Rules of ORder. There's an online website, too, but I prefer the 150 pages books I have that are dog-eared and highlighted from many, many uses. (I use two books by D. Zimmerman and D. Patnode, but there are plenty to pick from at any big book store.)
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