This is the 9500th most frequent Polish word.
wieloletnią
The Polish word "wieloletnią" means "long-term" or "multi-year" in English, depending on context.
"Wieloletnią" is used here to indicate the extended duration of time the teacher has been in that role.
Spędziłem wiele lat, ucząc się od mojej wieloletniej nauczycielki.
I spent many years learning from my longtime teacher.
"Wieloletnia" describes the plant's characteristic of surviving and thriving across multiple years.
Ta roślina jest znana jako wieloletnia, ponieważ żyje przez wiele lat.
This plant is known as perennial because it lives for many years.
"Wieloletnia" conveys the lasting and enduring nature of their friendship over a significant period.