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Perennial A   Continuing Or   For Long Time Happening

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perennial

Back 1 continuing or 
existing
https://www.ldoceonline.com/dictionary/existing
 for a long time, or happening again and again 

Lack of resources has been a perennial problem since the beginning.
 

Teddy bears are a perennial favorite with children.

2
 a plant that is perennial lives for more than two years → annual

Tags: essentials

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