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1.
1. A person's college or high school of attendance.
2. Also refers to a school's anthem or song.
My alma matter is Penn State University.
I can sing my school's alma mater.
by Tyrannus Maximus July 11, 2006
 
2.
An institution that has ceased to give a flying fuck about you post-graduation but keeps in touch in case you do something they can publicize or make money they can ask for.
My alma mater sent a donation envelope to my shack in the hood.
by FoxBat March 27, 2008