Britannica Dictionary definition of BEST superlative form of 1well 1  : from the best way : in a method which is a lot better than all Many others The sauce is best to test as hard as is possible. He'll do his best to be right here by the due date. bes يبذل يَبْذُلُ قُصارى جَهْدِه правя всичко, на коет�