Definition of smoothly adverb from the Oxford Advanced American Dictionary

      

    smoothly

     adverb
    adverb
    NAmE//ˈsmuðli//
     
     
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  1. 1in an even way, without suddenly stopping and starting again Traffic is now flowing smoothly again. The engine was running smoothly.
  2. 2without problems or difficulties The interview went smoothly. My job is to see that everything runs smoothly and according to plan. The rescue was carried out smoothly and efficiently.
  3. 3in a calm or confident way “Would you like to come this way?” he said smoothly.
  4. 4in a way that produces a smooth surface or mixture The colors blend smoothly together.
See the Oxford Advanced Learner's Dictionary entry: smoothly