那所學校的歌（美式用法）
從「學校像一位母親」再走一步：這位母親也有自己的聲音。用同一個名字去指那首代表她的歌，就是這一組用法。
noun · C1
In American English, the official song of a school or college, sung by students and former students at games, ceremonies, and reunions.
校歌
核心畫面
You can think of alma mater as a school seen as the mother who fed you and brought you up. You grew there, then you left, and the place stays behind, still counting as yours. That is why the word almost always belongs to someone: it is my, her, or his alma mater, never just a school on a map. Once you can see that mother standing there, the second use follows easily: she has a voice, and that voice is the song everyone stands up to sing.
alma mater 可以想成：把學校看成一位把你餵養長大的母親。你在那裡長大，後來離開了。那個地方還留在原處，而且…更多收起
alma mater 可以想成：把學校看成一位把你餵養長大的母親。你在那裡長大，後來離開了。那個地方還留在原處，而且還算是你的。所以這個字幾乎一定連著某個人——是「誰的」母校。中文說「母校」，畫面其實一模一樣。看得到這位「母親」之後，第二個用法就很好接：她也有自己的聲音，那個聲音就是大家會站起來一起唱的那首校歌。From the word’s history
Latin alma mater means literally 'nourishing mother'. The phrase comes from the full name of the University of Bologna, the oldest university in Europe, which calls itself Alma Mater Studiorum, the nourishing mother of studies.
拉丁文 alma māter 字面就是「滋養人的母親」。這個說法來自歐洲最古老的波隆那大學：它的全名裡有 Alma Mater Studiorum，意思是「學問的滋養之母」。所以今天說 my alma mater，裡面還留著「養育我的地方」這層意思。
Wiktionary entry for alma mater, supplied in this batch's evidence packet (source_ref kaikki:3f6f69a190036ae4:1391468329).
From the picture
Also in this word
noun · C1
The school, college, or university that someone went to in the past. It is normally used with a possessive in front of it: my alma mater, her alma mater, or a person's name plus 's.
母校