clear and shrill: the clarion call of a battle trumpet.
an ancient trumpet with a curved shape.
the sound of this instrument.
any similar sound.

1275–1325; Middle English < Medieval Latin clāriōn- (stem of clāriō) trumpet, equivalent to clār- clear + -iōn- -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clarion (ˈklærɪən)
1.  a four-foot reed stop of trumpet quality on an organ
2.  an obsolete, high-pitched, small-bore trumpet
3.  the sound of such an instrument or any similar sound
4.  (prenominal) clear and ringing; inspiring: a clarion call to action
5.  to proclaim loudly
[C14: from Medieval Latin clāriō trumpet, from Latin clārus clear]

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

early 14c., from O.Fr. clarion, from M.L. clarionem (nom. clario) "a trumpet," from L. clarus "clear."
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Clarion definition

A family of systems from SoftVelocity, Inc. for building database applications on Microsoft Windows. Clarion products include Clarion 4GL language with a C++ and Modula-2 compiler. Clarion products support fast, efficient database application development. Clarion was originally developed by Clarion Software Corporation, later to become TopSpeed Corporation. In 2000, the Clarion product line was acquired by SoftVelocity Inc.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Clarion has been making dashboards glow green with car stereos for years.
The military's record of answering those clarion calls has been uneven, however.
At the other end, you have the clarion call to treat cyberspace as a theater in a war.
But two studies released this fall added a sour note to the clarion call.
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