in a perfect manner or to a perfect degree: to sing an aria perfectly.
completely; fully; adequately: This will suit my purpose perfectly. He’s perfectly happy to help out. She’s perfectly capable of making her own decision.

1275–1325; perfect + -ly; replacing Middle English parfitly, derivative of parfit (see perfect)

1. flawlessly, superbly, ideally. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To perfectly
World English Dictionary
perfectly (ˈpɜːfɪktlɪ)
1.  completely, utterly, or absolutely
2.  in a perfect way; extremely well

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
There was a reason her students who turned in lame term papers could also churn
  out perfectly fine blogs.
They are perfectly uniform in size, shape and shade of yellow.
The cryonic preservation worked perfectly, but our revival procedure still has
  a few kinks.
Perfectly ethical souls spare nothing to help a dying lover.
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