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onus

 - 3 dictionary results

o⋅nus

[oh-nuhs]
–noun, plural o⋅nus⋅es.
1. a difficult or disagreeable obligation, task, burden, etc.
2. burden of proof. Compare onus probandi.
3. blame or responsibility.

Origin:
1630–40; < L: load, burden


1. responsibility, weight, duty, load.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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o·nus   (ō'nəs)   
n.  
  1. A difficult or disagreeable responsibility or necessity; a burden or obligation.

    1. A stigma.

    2. Blame.

  2. The burden of proof: The onus was on the defense attorney.


[Latin.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

onus 
c.1640, from L. onus (gen. oneris) "load, burden." Hence legal L. onus probandi (1722), lit. "burden of proving."
Online Etymology Dictionary, © 2001 Douglas Harper
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