[en-ee-wuhn, -wuhn]
any person at all; anybody: Did anyone see the accident?

1350–1400; Middle English ani on. See any, one

Anyone as a pronoun meaning “anybody” or “any person at all” is written as one word: Does anyone have the correct time? The two-word phrase any one means “any single member of a group of persons or things” and is often followed by of: Can any one of the members type? Any one of these books is exciting reading. Anyone is somewhat more formal than anybody. See also each, they. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
anyone (ˈɛnɪˌwʌn, -wən)
1.  any person; anybody
2.  (used with a negative or a question) a person of any importance: is he anyone in this town?
3.  (often preceded by just) any person at random; no matter who

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

O.E., from any + one. O.E. also used ænigmon in this sense.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Anyone who could read and write could serve as teacher.
Anyone who wants less is lacking in ambition bewildered.
The idea that an online encyclopedia that anyone can edit can provide
  high-quality content is increasingly established.
New research suggests that appealing to feminine tastes throughout the animal
  kingdom is more complicated than anyone anticipated.
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