This is the 3357th most frequent Japanese word.
書簡
"書簡" means "letter" or "correspondence."
Here, 書簡 refers to a formal letter or correspondence and is used as a noun object in the sentence.
私は昨日、友人からの書簡を受け取りました。
I received a letter from a friend yesterday.
In this context, 書簡 is used in a more general sense to signify the act of composing formal letters or correspondences.
書簡を書く時には、文法や表現に注意してください。
When writing a formal letter, pay attention to grammar and expression.
The term 書簡 here pertains to historical letters or written communications, highlighting its use in discussing specific categories of letters.