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anyone

[en-ee-wuhn, -wuh n]
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pronoun
  1. any person at all; anybody: Did anyone see the accident?
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Origin of anyone

First recorded in 1350–1400, anyone is from the Middle English word ani on. See any, one

Usage note

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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for anyone's

anyone

pronoun
  1. any person; anybody
  2. (used with a negative or a question) a person of any importanceis he anyone in this town?
  3. (often preceded by just) any person at random; no matter who
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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

Word Origin and History for anyone's

anyone

n.

Old English, two words, from any + one. Old English also used ænigmon in this sense. One-word form from 1844.

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Online Etymology Dictionary, © 2010 Douglas Harper