Meaning of “best” - Learner’s Dictionary

best

adjective us uk /best/
She's my best mate.What's the best method of solving this problem?He was nominated as best actor.Who won the Oscar for best actress this year?New York boasts some of the best museums in the world.

A1 superlative of good adjective : better than any other:

She's one of our best students.
Give her my best wishes.
Susie's my best friend (= the friend I like more than any other).
What's the best way to get to the airport from here?
→ See also second best , the best/greatest thing since sliced bread

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