clearly or fully known: The well-known reasons are obvious.
generally or widely known: a well-known painting.

1425–75; late Middle English

2. prominent, famous, noted, celebrated.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  widely known; famous; celebrated
2.  known fully or clearly

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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Word Origin & History

c.1470, from well (adv.) + pp. of know.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They are well known to school officials, perhaps even too well known, but they
  make no apologies for being vigilant.
If your recommender is moderately well known and people know that she has this
  foible, you are still fine.
Law and medical students are ready for that, but the weeding out of students in
  the arts and sciences isn't so well known.
As is well known, drug costs have already declined dramatically.
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