Definition of existentialism noun from the Oxford Advanced Learner's Dictionary

 

existentialism

 noun
noun
BrE BrE//ˌeɡzɪˈstenʃəlɪzəm//
 
; NAmE NAmE//ˌeɡzɪˈstenʃəlɪzəm//
 
[uncountable](philosophy)
 
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the theory that humans are free and responsible for their own actions in a world without meaning Word Origintranslating Danish existents-forhold ‘condition of existence’ (frequently used by Kierkegaard), from existential.
See the Oxford Advanced American Dictionary entry: existentialism