Definitions of best:

• noun:   the supreme effort one can make

  Example: "They did their best"

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

  Example: "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

  Example: "The goal was to best the competition"

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

  Example: "The best film of the year"

• adverb:   it would be sensible

  Example: "You'd best stay at home"

• adverb:   in a most excellent way or manner

  Example: "He played best after a couple of martinis"

• adverb:   from a position of superiority or authority

  Example: "Father knows best"

• name:  A surname (common: 1 in 6250 families; popularity rank in the U.S.: #737)