This is the 375th most frequent Japanese word.
出場
Participation; appearance (in an event).
Here, '出場' is used to indicate participation in an event, specifically the Olympics.
彼はオリンピックに出場した。
He participated in the Olympics.
Here, '出場' is associated with the act of taking part in an event for the first time, emphasizing the landmark nature of her participation.
彼女の初めての出場は成功でした。
Her first participation was a success.
In this case, '出場' refers to taking part in a scheduled competition or event.