verb (used without object), verb (used with object)
to become or make broad.

1720–30; broad + -en1

overbroaden, verb
rebroaden, verb
unbroadened, adjective

extend, expand, enlarge, widen; enlighten, inform, educate; sophisticate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
broaden (ˈbrɔːdən)
to make or become broad or broader; widen

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

1727, from broad + -en (1). The word seems no older than this date (discovered by Johnson in one of Thomson's season poems); broadened also is first found in the same poet, and pp. adj. broadening is recorded from 1850.
Online Etymology Dictionary, © 2010 Douglas Harper
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