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1.
A phrase used to indicate that the preceding phrase is true, both as it is, and also if you flip the two terms within.
You can save energy by saving water - and vice versa. (You can save energy by saving water, and you can save water by saving energy.)
by Em S January 30, 2009
 
2.
When something is opposite of another thing.
"If your team scores, you get 5 points, and vice versa"
"Lol, my shirt is vice versa"
by Lukas P May 06, 2008