[n. ik-ses, ek-ses; adj., v. ek-ses, ik-ses]
the fact of exceeding something else in amount or degree: His strength is in excess of yours.
the amount or degree by which one thing exceeds another: The bill showed an excess of several hundred dollars over the estimate.
an extreme or excessive amount or degree; superabundance: to have an excess of energy.
a going beyond what is regarded as customary or proper: to talk to excess.
immoderate indulgence; intemperance in eating, drinking, etc.
more than or above what is necessary, usual, or specified; extra: a charge for excess baggage; excess profits.
verb (used with object)
to dismiss, demote, transfer, or furlough (an employee), especially as part of a mass layoff.

1350–1400; Middle English (noun and adj.) < Latin excessus departure, digression, equivalent to exced-, variant stem of excēdere to exceed + -tus suffix of v. action

access, assess, excess.

3. surplus.

3. lack, deficiency.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  the state or act of going beyond normal, sufficient, or permitted limits
2.  an immoderate or abnormal amount, number, extent, or degree too much or too many: an excess of tolerance
3.  the amount, number, extent, or degree by which one thing exceeds another
4.  chem a quantity of a reagent that is greater than the quantity required to complete a reaction: add an excess of acid
5.  overindulgence or intemperance
6.  chiefly (Brit) insurance a specified contribution towards the cost of a claim, stipulated on certain insurance policies as being payable by the policyholder
7.  in excess of of more than; over
8.  to excess to an inordinate extent; immoderately: he drinks to excess
9.  more than normal, necessary, or permitted; surplus: excess weight
10.  payable as a result of previous underpayment: excess postage; an excess fare for a railway journey
[C14: from Latin excessus, from excēdere to go beyond; see exceed]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., from L. excessus "departure, going beyond the bounds of reason or beyond the subject," from stem of excedere "to depart, go beyond" (see exceed).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

excess ex·cess (ĭk-sěs', ěk'sěs')
An amount or quantity beyond what is normal or sufficient; a surplus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
We tend to see whales as symbols of conservation, and sometimes even symbols of
  conservation's excesses.
We scholars have done little to rectify the situation, what with our boring
  books and our excesses of anti-charisma.
Which sometimes leaves us the next morning with uncomfortable reminders of our
The bill seems to be protecting all the excesses of the private healthcare
  business and still tries to cover everyone.
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