Meaning of “most” - Learner’s Dictionary

most

adverb uk us /məʊst/
the most attractive/important/popular, etc

A2 used to show that someone or something has the greatest amount of a quality:

She's the most beautiful girl I've ever seen.
There are various reasons but this is the most important.

A2 more than anyone or anything else:

Which subject do you like most?
Sam enjoyed the swings most of all.

(Definition of “most adverb” from the Cambridge Learner’s Dictionary © Cambridge University Press)