This is the 6955th most frequent Russian word.
апостольской
"Apostolic."
"Апостольским" is used here as an adjective describing the feat related to apostles, indicating a significant spiritual accomplishment akin to that of apostles.
Она восхищается апостольским подвигом многих проповедников.
She admires the apostolic feat of many preachers.
"Апостольская" describes the service as related to apostolic tradition or practice within the religious context.
В храме началась апостольская служба, посвящённая памяти святого.
An apostolic service dedicated to the memory of the saint began in the temple.
"Апостольской" is used to characterize the manner of life that emphasizes evangelical mission, akin to apostolic principles.