/ ˈpɜːmənəns; NAmE ˈpɜːrm-/ (also less frequent per·man·ency / -nənsi; NAmE /) noun
[ U ] the state of lasting for a long time or for all time in the future :
The spoken word is immediate but lacks permanence.
We no longer talk of the permanence of marriage.
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WORD ORIGIN
late Middle English : from medieval Latin permanentia (perhaps via French ), from permanent- remaining to the end, from the verb permanere .