Definition of best adverb from the Oxford Advanced American Dictionary

     

    best

     adverb
    adverb
    NAmE//bɛst//
     
     
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  1. 1(superlative of well, often used in adjectives)
  2. 2most; to the greatest extent Which one do you like best? Well-drained soil suits the plant best. her best-known poem
  3. 3 in the most excellent way; to the highest standard He works best in the mornings. Hollywood's best-dressed woman The beaches are beautiful, but best of all, there are very few tourists.
  4. 4 in the most suitable or appropriate way Painting is best done in daylight. Do what you think best (= what you think is the most suitable thing to do).
  5. Idioms
    as best (as) you can
     
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    not perfectly but as well as you are able We'll manage as best we can.
    had best (do something)
     
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    used to tell someone what you think they should do You'd best clear up that mess before Mom gets home.
See the Oxford Advanced Learner's Dictionary entry: best