The difference was explained by Ikari many posts ago. Majority is one more than half. Perhaps your sticking point is in identifying what is the whole? The whole is all votes cast for a particular office or issue. Percents are whatever percent various candidates or positions get. If the winner with the most votes gets more than half, they've won a majority. If the winner with the most votes gets less than half, they've won a plurality.
Actually, I kind of think you do know the difference, b/c you've failed to provide your definition link, even after being asked twice. I think your link will explain to you why you're wrong, as well.