<p><strong>Noun</strong></p><ul><li>the state or character of being perpetual (often preceded by in): to desire happiness in perpetuity.</li><li>endless or indefinitely long duration or existence; eternity.</li><li>something that is perpetual.</li><li>an annuity paid for life.</li><li>Law: an interest under which property is less than completely alienable for longer than the law allows.</li></ul>