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onus

[oh-nuh s] /ˈoʊ nəs/
noun, plural onuses.
1.
a difficult or disagreeable obligation, task, burden, etc.
2.
burden of proof.
Compare onus probandi.
3.
blame or responsibility.
Origin
1630-1640
1630-40; < Latin: load, burden
Synonyms
1. responsibility, weight, duty, load.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for onuses

onus

/ˈəʊnəs/
noun (pl) onuses
1.
a responsibility, task, or burden
Word Origin
C17: from Latin: burden
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for onuses

onus

n.

1640s, from Latin onus "load, burden," figuratively "tax, expense; trouble, difficulty," from PIE *en-es- "burden" (cf. Sanskrit anah "cart, wagon"). Hence legal Latin onus probandi (1722), literally "burden of proving."

Online Etymology Dictionary, © 2010 Douglas Harper
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