This is the 11346th most frequent Swedish word.
mångårig
"Having many years; long-standing."
Here, 'mångårig' is used as an adjective to describe the substantial duration of someone's experience, emphasizing their long-term expertise.
Han har en mångårig erfarenhet inom finanssektorn.
He has extensive long-term experience in the finance sector.
In this sentence, 'mångårigt' describes the age of an object (the tree), indicating its existence over many years.
Trädet på gården är mångårigt och har stått där sedan min farfar var barn.
The tree in the yard is many years old and has been there since my grandfather was a child.
This usage of 'mångårig' refers to the duration of an intensive activity (research), highlighting its prolonged and dedicated nature.