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Permanent

/ˈpɜːmənənt/

Lasting or intended to last indefinitely without change or end.

Synonyms:

Everything permanent, everything continuous called for 'Right!'It was a permanent condition with Ralph.Her permanent scar was a reminder of the past.

The word permanent derives from the Latin permanens, present participle of permanere meaning to remain, from per- (through) + manere (to remain).

29 mentions per 1 million words

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Hint: Frequency according to COCA