the final solution noun, historical the German Nazi policy and process, from 1941, of exterminating European Jews.
ETYMOLOGY: 1940s: English version of the German Endlösung.
http://www.chambersharrap.co.uk/chambers/feat...

Main Entry: final solution
Function: noun
Usage: often capitalized F&S
Date: 1947
: the Nazi program for extermination of all Jews in Europe
http://www.merriam-webster.com/dictionary/fin...

End|lö|sung, die: a) (nationalsoz. verhüll.) (von den Nationalsozialisten geplante) vollständige Vernichtung der europäischen Juden; b) ...
http://www.duden.de/suche/index.php?suchwort=...
[Note: Don't have a subscription so can't read rest of entry, therefore including entry from my printed Duden below.]

Endlösung, die: a) (selten) endgültige Lösung; b) (ns. verhüll.) [Plan zur] Ausrottung der europäischen Juden
Duden, Deutsches Universal Wörterbuch A-Z, 1989

LEO already has an entry
Dictionary: endloesung

but prompted by this discussion
related discussion: Endlösung

I propose the following changes for consideration:

1) Mark existing entries as "historical/Geschichte"
2) Indicate that in the English term Final and Solution are often capitalized.