noun, plural frenzies.
extreme mental agitation; wild excitement or derangement.
a fit or spell of violent mental excitement; a paroxysm characteristic of or resulting from a mania: He is subject to these frenzies several times a year.
verb (used with object), frenzied, frenzying.
to drive to frenzy; make frantic: She was frenzied by fear when she smelled the smoke.

1300–50; Middle English frenesie < Old French < Late Latin phrenēsis < Late Greek, for Greek phrenîtis; see phrenitis

frenzily, adverb

2. madness, insanity, lunacy, aberration; rage, fury, raving.

1. calm. 2. sanity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
frenzy (ˈfrɛnzɪ)
n , pl -zies
1.  violent mental derangement
2.  wild excitement or agitation; distraction
3.  a bout of wild or agitated activity: a frenzy of preparations
vb , -zies, -zies, -zying, -zied
4.  (tr) to make frantic; drive into a frenzy
[C14: from Old French frenesie, from Late Latin phrēnēsis madness, delirium, from Late Greek, ultimately from Greek phrēn mind; compare frenetic]

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

mid-14c., from O.Fr. frenesie, from M.L. phrenesia, from phrenesis, back formation from L. phreneticus "delirious" (see frenetic). Related: Frenzied.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Follow the frenzy of activity as a small army of employees whirls behind the
  scenes of a major state dinner.
Follow along as a small army of employees whirls behind the scenes in a frenzy
  of activity surrounding a major state dinner.
The news set off a frenzy of calls to doctors from people anxious to know if
  this really was some magic cure.
While many older volumes have found homes in special collections, these are in
  danger of being lost to the digitization frenzy.
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