(of a disease) prevalent throughout an entire country, continent, or the whole world; epidemic over a large area.
general; universal: pandemic fear of atomic war.
a pandemic disease.

1660–70; < Late Latin pandēm(us) < Greek pándēmos common, public (pan- pan- + dêm(os) the people + -os adj. suffix) + -ic

pandemia [pan-dee-mee-uh] , noun
pandemicity [pan-duh-mis-i-tee] , noun
interpandemic, adjective

endemic, epidemic, pandemic. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pandemic (pænˈdɛmɪk)
1.  (of a disease) affecting persons over a wide geographical area; extensively epidemic
2.  a pandemic disease
[C17: from Late Latin pandēmus, from Greek pandēmos general, from pan- + demos the people]

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

1666, from Gk. pandemos "pertaining to all people," from pan- "all" + demos "people" (see demotic). Modeled on epidemic. The noun is first recorded 1853, from the adj.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pandemic pan·dem·ic (pān-děm'ĭk)
Epidemic over a wide geographic area. n.
A pandemic disease.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pandemic   (pān-děm'ĭk)  Pronunciation Key 
An epidemic that spreads over a very wide area, such as an entire country or continent.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

pandemic definition

A widespread epidemic affecting a large part of the population.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
This could be the beginning of an influenza pandemic.
He is working to stop the next global pandemic before it starts.
The pandemic has spread throughout the world's oceans with devastating effects
  on these docile sea-dwelling reptiles.
The death toll would climb much higher in the event of a new global pandemic or
  bioterror attack.
Related Words
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