This is the 13997th most frequent Russian word.
объявленных
"Объявленных" means "declared" or "announced."
Here, 'объявленных' modifies 'вакансий', denoting vacancies that had been previously announced.
Список объявленных вакансий был опубликован на сайте компании.
The list of announced job vacancies was published on the company's website.
The term 'объявленных' is used as an adjective in plural genitive form, modifying 'мероприятий', indicating events that have been announced.
Учащиеся должны были написать эссе на тему объявленных мероприятий.
Students were required to write an essay on the topic of the announced events.
In this instance, 'объявленных' describes 'поездок', referring to trips that have been officially announced.