This is the 735th most frequent Finnish word.
kirkossa
"In the church."
The word 'kirkossa' is used here to indicate a location (in the church).
Olimme eilen kirkossa viisiminuuttisen tilaisuuden vuoksi.
We were in the church yesterday for a five-minute occasion.
The word 'kirkossa' describes the location where the event occurred (in the church), emphasizing the acoustics of the place.
Hänen äänensä kaiku kuulosti kauniilta kirkossa.
His voice's echo sounded beautiful in the church.
Here, 'kirkossa' tells the audience where an event will take place (at the church).