This is the 15559th most frequent Russian word.
прибывшая
"Прибывшая" means "arrived" or "the one who arrived" (feminine).
In this sentence, 'прибывшая' is used as a past participle describing the woman, indicating that she has arrived at the station.
Прибывшая на вокзал женщина быстро взяла сумку.
The woman who arrived at the station quickly picked up her bag.
Here, 'прибывшую' is the accusative singular feminine form of the past participle, describing the group that was awaited.
Мы ждали прибывшую группу у входа в театр.
We waited for the group that arrived at the entrance of the theater.
In this third example, 'прибывшие' is the plural nominative form, referring to the documents that arrived last week.