desertion Syllabification: (de·ser·tion)Pronunciation: /dəˈzərSHən/Translate desertion | into German | into Italian | into Spanish Definition of desertion noun the action of deserting a person, cause, or organization:her mother 's desertion of her family Military the action of illegally leaving the armed forces:three officers were shot for desertion the number of desertions was risingdesertion in other Oxford dictionaries Definition of desertion in the British & World English dictionary