for the most part; almost wholly; just about: He is virtually unknown.

1400–50; late Middle English; see virtual, -ly

figuratively, literally, virtually (see usage note at literally). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
virtually (ˈvɜːtʃʊəlɪ)
in effect though not in fact; practically; nearly

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

early 15c., "as far as essential qualities or facts are concerned;" from virtual. Sense of "in effect, as good as" is recorded from c.1600.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Today, however, virtually every college and university in the nation has an
  elaborate strategic plan.
Demography means virtually all of us will have to work longer.
The same features have emerged, and they are virtually indistinguishable from
  tissue samples from modern species.
Scientists often experiment virtually with computer models, but developing such
  software is time-consuming and difficult.
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