WordReference Random House Learner's Dictionary of American English © 2017
great•ly /ˈgreɪtli/USA pronunciation  adv. 
  1. very much;
    to a great degree:His health has greatly improved.

WordReference Random House Unabridged Dictionary of American English © 2017
great•ly  (grātlē),USA pronunciation adv. 
  1. in or to a great degree;
    much:greatly improved in health.
  2. in a great manner.
  • 1150–1200; Middle English gretli; see great, -ly

'greatly' also found in these entries:
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