This is the 3522nd most frequent Korean word.
모임이
"모임이" means "a gathering" or "a meeting."
The word 모임이 is the subject of the sentence, referring to a specific gathering or meeting scheduled to occur today.
모임이 오늘 오후에 있습니다.
The gathering is this afternoon.
Here, 모임이 is used to describe the meeting that might be delayed, functioning as the subject.
모임이 늦어질 것 같아요.
It seems the meeting will be delayed.
In this instance, 모임이 signifies the meeting whose conclusion is being referenced for the subsequent action of talking.