noun, plural responsibilities.
the state or fact of being responsible, answerable, or accountable for something within one's power, control, or management.
an instance of being responsible: The responsibility for this mess is yours!
a particular burden of obligation upon one who is responsible: the responsibilities of authority.
a person or thing for which one is responsible: A child is a responsibility to its parents.
reliability or dependability, especially in meeting debts or payments.
on one's own responsibility, on one's own initiative or authority: He changed the order on his own responsibility.

1780–90; respons(ible) + -ibility

nonresponsibility, noun, plural nonresponsibilities.
preresponsibility, noun, plural preresponsibilities.
self-responsibility, noun
superresponsibility, noun, plural superresponsibilities.

1. answerability, accountability. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
responsibility (rɪˌspɒnsəˈbɪlɪtɪ)
n , pl -ties
1.  the state or position of being responsible
2.  a person or thing for which one is responsible
3.  the ability or authority to act or decide on one's own, without supervision

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

"condition of being responsible," 1787, from responsible + -ity.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
So please, don't blame an environmentalist clamoring for responsibility.
If you do not take your responsibility in it, don't go blame the professor.
She has no personal responsibility other than that of being hostess.
But to hold an egg that actually contains nascent life is quite another matter,
  a tremendous responsibility.
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