Definition of best adjective from the Oxford Advanced American Dictionary

      

    best

     adjective
    adjective
    NAmE//bɛst//
     
     
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  1. 1(superlative of good)
  2. 2of the most excellent type or quality That's the best movie I've ever seen! He wrote his best songs before he was 25. She was one of the best tennis players of her generation. Is that your best suit? They've been best friends (= closest friends) since they were children. the company's best-ever results We want the kids to have the best possible education.
  3. 3most enjoyable; happiest Those were the best years of my life.
  4. 4most suitable or appropriate What's the best way to cook steak? The best thing to do would be to apologize. He's the best man for the job. It's best if you go now. I'm not in the best position to advise you.
See the Oxford Advanced Learner's Dictionary entry: best