This is the 6900th most frequent Korean word.
자당
"자당" is an honorific term meaning "one's mother."
In this sentence, '자당' is used in a very respectful form to refer to someone's mother, often in formal contexts.
자당께서는 건강하시다니 기쁩니다.
I am glad to hear that your mother is doing well.
Here, '자당' denotes respect when referring to the mother of whomever is being addressed.
자당의 뜻을 따르겠습니다.
I will follow the wish of your esteemed mother.
In this example, '자당' is used respectfully inquiring about someone's mother, showing courtesy.