Compare these two definitions from Merriam-Webster.

3
a : a number or percentage equalling more than half of a total a majority of voters a two-thirds majority
b : the excess of a majority over the remainder of the total : margin won by a majority of 10 votes
c : the greater quantity or share the majority of the time

4
: the group or political party having the greater number of votes (as in a legislature)

You can select which one you prefer, they are almost opposites.