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well-known

[wel-nohn] /ˈwɛlˈnoʊn/
adjective
1.
clearly or fully known:
The well-known reasons are obvious.
2.
generally or widely known:
a well-known painting.
Origin of well-known
late Middle English
1425-1475
1425-75; late Middle English
Synonyms
2. prominent, famous, noted, celebrated.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for well-known

well-known

adjective (well known when postpositive)
1.
widely known; famous; celebrated
2.
known fully or clearly
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for well-known
adj.

late 15c., from well (adv.) + past participle of know.

Online Etymology Dictionary, © 2010 Douglas Harper
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7
9
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