This is the 8687th most frequent Swedish word.
brevet
"Brevet" in Swedish means "the letter" in English.
Here, 'brevet' is the definite form of 'brev', meaning 'letter'. It is used to refer specifically to 'the letter' mentioned in the conversation context.
Jag läste brevet noggrant.
I read the letter carefully.
In this sentence, 'brevet' again is the definite singular form of 'brev', emphasizing the particular letter being described as informative.
Brevet var mycket informativt.
The letter was very informative.
The use of 'brevet' as the definite form of 'brev' presents focus on 'the letter' being talked about as the direct object of the action.