Regrettable Necessity, n:
An avoidable atrocity. The term is often employed by presidents and prime ministers when announcing bombings of civilian targets and invasions of small countries.-- Chaz Bufe (The Devil's Dictionaries)
Academe, n:
An ancient school where morality and philosophy were taught.
Academy, n:
[from Academe] A modern school where football is taught.-- Ambrose Bierce (The Devil's Dictionary)