Definition of "Best" :

noun: the supreme effort one can make

"They did their best."

noun: the person who is most outstanding or excellent; someone who tops all others

"He could beat the best of them."

noun: Canadian physiologist (born in the United States) who assisted F. G. Banting in research leading to the discovery of insulin (1899-1978)

verb: get the better of

"The goal was to best the competition."

adjective: (comparative and superlative of well') wiser or more advantageous and hence advisable

"The White House thought it best not to respond."

adjective: (superlative of good') having the most positive qualities

"The best film of the year."

adverb: it would be sensible

"You'd best stay at home."

adverb: in a most excellent way or manner

"He played best after a couple of martinis."

adverb: from a position of superiority or authority

"Father knows best."