A majority is the greater part, or more than half, of the total. It is a subset of a set consisting of more than half of the set's elements.
Just to make things clear to those folks who do not seem to understand what a majority is:
* The population of the United States is approximately 322 million people. Donald Trump was not elected by a majority of the people in the United States.
* The number of registered voters in this country is approximately 200 million. Donald Trump was not elected by a majority of the voters in the United States.
* The number of votes cast in the 2016 presidential election was approximately 125 million. Donald Trump was not elected by a majority of the people who voted in the United States.
* Hillary Clinton got 60,274,974 votes and Donald Trump got 59,937,338. Head to head, Donald Trump was not even elected by a majority of people who chose between him and Clinton.
* The only majority that Donald Trump won was Electoral College votes and that is why he is President-elect.
The same situation occurred most recently in 2000, when George W. Bush won over Al Gore, despite having lost the popular vote. That it has happened for a second time in less than two decades will no doubt spark another debate about the value / necessity of the Electoral College.
Got it? Good.
Now don't get me started on what a mandate is!