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All Clear

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Definition of the noun all clear

What does all clear mean as a name of something?


  1. a signal (usually a siren) that danger is over
  2. permission to proceed because obstacles have been removed


  1. "All Clear" is a composition.
  2. "All Clear" is a musical album of Nuuro.
  3. "All Clear" is a composition.


"All Clear" a.k.a. "Blackout/All Clear": Blackout and All Clear are the two volumes that comprise a 2010 science fiction novel by American author Connie Willis. Blackout was published February 2, 2010 by Spectra. The second part, the conclusion All Clear, was released as a separate book on October 19, 2010. The diptych won the 2010 Nebula Award for Best Novel, the 2011 Locus Award for Best Science Fiction Novel, and the 2011 Hugo Award for Best Novel. These two volumes are the most recent of four books and a short story that Willis has written involving time travel from Oxford during the mid 21st century.


All clear a.k.a. All-clear: An all-clear is a term used by civil defense or military authorities to inform others that an imminent physical danger has passed. This typically will end an alert or warning status that was previously issued. The all-clear can be given vocally, through media — such as television or radio, or via means of civil defense broadcast systems such as air raid and tornado sirens.

Printed encyclopedias and other books with definitions for All Clear

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Google previewEncyclopedia of Microcomputers (2000)

Volume 25 - Supplement 4 by Allen Kent, James G. Williams

Find all clear best hypotheses and add them to the composite.

Google previewEncyclopedia of Library and Information Science (1999)

Volume 64 - Supplement 27 - Access Versus Ownership to Word Formation in Language and Computation by Allen Kent

Find all clear best hypotheses and add them to the composite. A clear best hypothesis is one that explains a finding better than any other hypothesis and has a reasonably high plausibility. If clear best hypotheses are found, then propagate the ...

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All Clear

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Small photo of Isolated Prayer Wheel look from top and all clearSmall photo of Health workers give an all clear after ebola alarmSmall photo of MOORHEAD, MN/USA - MAY 2, 2015: Fiire alarm at apartment complex goes off and the Moorhead Fire Department are on the scene. Firefighters carry gear back to the fire truck after giving the all clear.Small photo of Inside the car view of a young drink and drive driver due to being subject to test for alcohol content with use of breathalyzer, happy as he is all clear More...

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All clear Meaning

Video shows what all clear means. a signal that danger, such as an air raid, is over; usually a siren at a single pitch. permission to proceed after obstacles have ...

See also the pronunciation examples of All Clear!

Quotes about All Clear

Our age is before all things a practical one. It demands of us all clear and tangible results of our work. (Theodor Svedberg)
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