This is the 3908th most frequent Korean word.
연이어
"One after another" or "in succession."
Here, '연이어' indicates consecutive actions, referring to publishing two books one after the other.
그녀는 연이어 두 권의 책을 출판했습니다.
She published two books in succession.
The term '연이어' is describing a sequence of rain happening without interruption.
비가 연이어 내렸습니다.
It rained continuously for days.
In this sentence, '연이어' is emphasizing successive victories in a competition.