trea·son

[tree-zuhn]
noun
1.
the offense of acting to overthrow one's government or to harm or kill its sovereign.
2.
a violation of allegiance to one's sovereign or to one's state.
3.
the betrayal of a trust or confidence; breach of faith; treachery.

Origin:
1175–1225; Middle English tre(i)so(u)n < Anglo-French; Old French traïson < Latin trāditiōn- (stem of trāditiō) a handing over, betrayal. See tradition

su·per·trea·son, noun


1. T reason , sedition mean disloyalty or treachery to one's country or its government. T reason is any attempt to overthrow the government or impair the well-being of a state to which one owes allegiance; the crime of giving aid or comfort to the enemies of one's government. S edition is any act, writing, speech, etc., directed unlawfully against state authority, the government, or constitution, or calculated to bring it into contempt or to incite others to hostility, ill will or disaffection; it does not amount to treason and therefore is not a capital offense. 2. See disloyalty.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To treason
00:10
Treason is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
treason (ˈtriːzən) [Click for IPA pronunciation guide]
 
n
1.  violation or betrayal of the allegiance that a person owes his sovereign or his country, esp by attempting to overthrow the government; high treason
2.  any treachery or betrayal
 
[C13: from Old French traïson, from Latin trāditiō a handing over; see tradition, traditor]
 
'treasonable
 
adj
 
'treasonous
 
adj
 
'treasonableness
 
n
 
'treasonably
 
adv

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

treason
early 13c., from Anglo-Fr. treson, from O.Fr. traison (11c.; Fr. trahison), from L. traditionem (nom. traditio) "a handing over, delivery, surrender" (see tradition). O.Fr. form influenced by the verb trair "betray." In old English law, high treason is violation by a subject
of his allegiance to his sovereign or to the state; distinguished from petit treason, treason against a subject, such as murder of a master by his servant.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But it was understood to be justified especially in treason cases, and where
  time was of the essence.
They regarded secession as treason, and emancipation as a noble cause.
It would be a treason to my first consciousness to un-Jew myself.
To prove it, he painted one during his trial, and was then imprisoned for
  forgery rather than treason.
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