To discharge or release military personnel from service and reduce armed forces back to a peacetime basis; American spelling.
From French 'démobiliser', combining 'dé-' (remove) + 'mobiliser' (from Latin 'mobilis', movable). The '-ize' ending is standard American English spelling.
The word 'mobilize' was invented during wartime to speed up military preparation, so when peace came, militaries had to 'demobilize'—it's a perfect example of how war vocabulary sticks around even in peacetime!
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