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Adverb: greatly  greyt-lee
  1. By a significant amount
    "he improved greatly";
    - markedly, significantly
  2. [informal] To a very great degree or extent
    - a lot, lots, a good deal, a great deal, much, very much, majorly [informal], enormously [informal]
  3. To a great extent; over a large range or scale
    "salaries vary greatly";
    - enormously, terrifically [informal], tremendously, hugely, immensely, vastly, massively [informal]