the condition or quality of being permanent; perpetual or continued existence.
Origin of permanence
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the state or quality of being permanent
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
early 15c., from Middle French permanence and directly from Medieval Latin permanentia (early 14c.), from Latin permanens (see permanent). Related: Permanency.
Online Etymology Dictionary, © 2010 Douglas Harper