Discharged from military service and converted to civilian status; past tense and past participle of demobilise (British spelling).
From 'demobilise' + '-ed'. British English spelling variant of 'demobilized', following the '-ise/-ised' convention used throughout British English.
Millions of British servicemen were 'demobilised' after the World Wars, and this word became so common that entire generations grew up hearing about 'demobilised soldiers' struggling to adjust to civilian life!
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