[pur-pi-too-i-tee, -tyoo-]
noun, plural perpetuities.
the state or character of being perpetual (often preceded by in ): to desire happiness in perpetuity.
endless or indefinitely long duration or existence; eternity.
something that is perpetual.
an annuity paid for life.
Law. an interest under which property is less than completely alienable for longer than the law allows.

1375–1425; late Middle English perpetuite < Latin perpetuitās. See perpetual, -ity

nonperpetuity, noun, plural nonperpetuities. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perpetuity (ˌpɜːpɪˈtjuːɪtɪ)
n , pl -ties
1.  eternity
2.  the state or quality of being perpetual
3.  property law a limitation preventing the absolute disposal of an estate for longer than the period allowed by law
4.  an annuity with no maturity date and payable indefinitely
5.  in perpetuity for ever
[C15: from Old French perpetuite, from Latin perpetuitās continuity; see perpetual]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1400; see perpetual.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It requires that land remain in its natural state for a stipulated period or in
Web users have voiced concern that their personal online footprints will be
  kept open for all to see in perpetuity.
The supply is replenished in perpetuity by the munificence of nature.
Life did not arise all over the planet at once and each population of lifeforms
  stayed in those places in perpetuity.
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