Definition of life force noun from the Oxford Advanced American Dictionary

     

    life force

     noun
    noun
     
    [uncountable]
     
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  1. 1 the force that gives someone or something their strength or energy He looked very weak—his life force seemed to have drained away.
  2. 2 the force that keeps all life in existence In Hindu philosophy ,the life force is known as prana.
See the Oxford Advanced Learner's Dictionary entry: life force