This is the 11479th most frequent Russian word.
долгосрочная
"Долгосрочная" means "long-term" in English.
The word 'долгосрочную' is an adjective in its feminine singular accusative form, describing 'стратегию' (strategy), indicating that the strategy is planned for a long period of time.
Она разрабатывает долгосрочную стратегию для компании.
She is developing a long-term strategy for the company.
The word 'долгосрочные' is the plural nominative form of the adjective, modifying 'инвестиции' (investments), referring to investments that span over an extended duration.
Долгосрочные инвестиции могут быть более выгодны.
Long-term investments can be more profitable.
The word 'долгосрочной' is in its feminine singular genitive form, modifying 'аренды' (renting), meaning that the renting period being discussed is an extended one.