n.
Function: noun
Inflected Form: plural best
Date: before 12th century
1 : the best state or part
2 : one that is best <the best falls short>
3 : the greatest degree of good or excellence
4 a : one's maximum effort <do your best > b : a best performance or achievement <ran a new personal best >
5 : best clothes <Sunday best >
– at best : under the most favorable circumstances