can·not

[kan-ot, ka-not, kuh-]
verb
1.
a form of ·can not.
2.
cannot but, have no alternative but to: We cannot but choose otherwise.

Origin:
1350–1400; Middle English


Cannot is sometimes also spelled can not. The one-word spelling is by far the more common: Interest rates simply cannot continue at their present level. The contraction can't is most common in speech and informal writing. See also can1.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Cannot is one of our favorite verbs.
So is peculate. Does it mean:
to swindle, cheat, hoodwink, or hoax.
to steal or take dishonestly (money, esp. public funds, or property entrusted to one's care); embezzle.
Collins
World English Dictionary
cannot (ˈkænɒt, kæˈnɒt) [Click for IPA pronunciation guide]
 
vb
an auxiliary verb expressing incapacity, inability, withholding permission, etc; can not

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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Etymonline
Word Origin & History

cannot
c.1400, from can (v.) + not. O.E. expressed the notion by ne cunnan.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Idioms & Phrases

cannot

see under can't.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
The blimp cannot fly where there is risk of snow and has difficulty transiting
  over mountains.
These teeth are so long that the viper cannot close its mouth completely.
The doctors cannot agree on a diagnosis, let alone administer an antidote with
  confidence.
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