This is the 7480th most frequent Russian word.
девятилетий
"Девятилетий" means "of nine years" or "nine-year" in English.
In this sentence, 'девятилетий' is used as an adjective to describe the film director, indicating his age.
Девятилетий кинорежиссёр получил свой первый приз.
The nine-year-old film director received his first award.
Here, 'девятилетий' is part of the title of a book and serves as an adjective describing the plan, suggesting it belongs to or pertains to a nine-year-old entity.
На полке лежит книга с названием 'Девятилетий план'.
On the shelf lies a book titled 'Nine-Year-Old's Plan'.
In this context, 'девятилетий' modifies the noun 'долгосрочности,' highlighting the duration of the project.