Definition of deus ex machina noun from the Oxford Advanced American Dictionary

 

deus ex machina

 noun
noun
NAmE//ˌdeɪəs ɛks ˈmɑkɪnə//
 
, NAmE//ˌdeɪəs ɛksˈmækɪnə//
 
[singular](literary)
 
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an unexpected power or event that saves a situation that seems without hope, especially in a play or novel
See the Oxford Advanced Learner's Dictionary entry: deus ex machina