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Definition of perpetuity:

  1. A perpetual annuity.
  2. Duration without limitations as to time.
  3. Endless time.
  4. Something that is perpetual.
  5. The number of years in which the simple interest of any sum becomes equal to the principal.
  6. The number of years' purchase to be given for an annuity to continue forever.
  7. The quality or condition of an estate by which it becomes inalienable, either perpetually or for a very long period; also, the estate itself so modified or perpetuated.
  8. The quality or state of being perpetual; as, the perpetuity of laws.

Synonyms:

life, sempiternity, eternalness, continue, eternality, world without end, continuance, continuity, limited.

Usage examples: