What is the difference between "the majority of" "a majority of" and "majority of"? When do we use definite article with word "majority"?
The majority of is more correct than the others.
A majority is, by definition, 51% or more of something. So 55% and 73% are also majorities.
When you refer to a majority (I'm using a here because I'm discussing majorities of all kinds), you are referring to the fact that it is essentially the greater part of something. The means there is only one greater part, which is correct because there can't be two majorities of one thing.