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Answer for the clue "The process of living through a number of years (as a perennial plant) ", 11 letters:
perennation

Word definitions for perennation in dictionaries

Wikipedia Word definitions in Wikipedia
In botany , perennation is the ability of organisms , particularly plants , to survive from one germinating season to another, especially under unfavourable conditions such as drought or winter. It typically involves development of a perennating organ , ...

WordNet Word definitions in WordNet
n. the process of living through a number of years (as a perennial plant)