https://en.wiktionary.org/wiki/plurality

4. (countable) A number or part of a whole which is greater than any other number or part, but not necessarily a majority.

5. (countable) A number of votes for a single candidate or position which is greater than the number of votes gained by any other single candidate or position voted for, but which is less than a majority of valid votes cast. Synonym: relative majority

6. (countable) A margin by which a number exceeds another number, especially of votes.

​

https://en.wiktionary.org/wiki/majority

1. More than half (50%) of some group.