
adj.
Relating to, constituting, or involving treason: Espionage is a treasonable act.
treasonably trea'son·a·bly adv.
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American Heritage Dictionary:
trea·son·a·ble |

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Roget's Thesaurus:
treasonable |
| treasonous | |
| Sir John Fenwick (English criminal) | |
| Edward Stafford Buckingham |
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![]() | American Heritage Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more |
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![]() | Roget's Thesaurus. Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary Copyright © 1995 byHoughton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. Read more |
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