“Majority” is one of those words that can be either singular or plural. Common sense works pretty well in deciding which. If you mean the word to describe a collection of individuals, then the word should be treated as plural: “The majority of e-mail users are upset about the increase in spam.” If the word is used to describe a collective group, then consider it singular: “A 90% majority is opposed to scheduling the next meeting at 6:00 A.M.” If you are uncertain which you mean, then choose whatever form sounds best to you; it’s not likely to bother many people.

“Majority” should be used only with countable nouns: “he ate the majority of the cookies,” but not “he ate the majority of the pie.” Instead say, “he ate most of the pie.”