This is the 6105th most frequent Korean word.
세번째
"세번째" means "third" in English.
In this sentence, '세번째' is used as a modifier to describe ordinal position, specifying the third item (book) in a sequence.
나는 세번째 책을 펼쳤다.
I opened the third book.
Here, '세번째로' indicates that the action of participating occurred in the third instance, signifying order of occurrence.
그는 세번째로 대회에 참가했다.
He participated in the competition for the third time.
In this instance, '세번째' acts as the subject, referring to the third item in a comparison or narrative sequence.