This is the 5262nd most frequent Japanese word.
高野連
"高野連" (こうやれん) refers to the Japan High School Baseball Federation, the governing body for high school baseball in Japan.
In this sentence, 高野連 is used to refer to the Japan High School Baseball Federation in its functional role as an organization.
高野連は高校野球の統括組織です。
The Japan High School Baseball Federation oversees high school baseball.
Here, 高野連 is specifically mentioned in its activity related to announcing policy changes, emphasizing its authority in decision-making.
昨日、高野連がルール改定を発表しました。
Yesterday, the Japan High School Baseball Federation announced rule changes.
In this example, 高野連 is described as the organizing entity behind tournaments where notable performances occurred.