The quality or condition of being permanent; permanency.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "permanence" in a sentence
"Object permanence is the concept that when we do not perceive an object, it continues to exist."
"I don't really believe that the word permanence exists in Juria's vocabulary :P."
"Considering that Damascus saw twenty-one changes of government in the twenty-four years preceding his coup, Assad's permanence is impressive."