frame of reference
noun phrase
1
                    
                                          
              
          
                                                      : an arbitrary set of axes with reference to which the position or motion of something is described or physical laws are formulated                                      
                
                    
2
                    
                                          
              
          
                                                      : a set of ideas, conditions, or assumptions that determine how something will be approached, perceived, or understood                                      
              
                             
a Marxian frame of reference
                         
                
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  Merriam-Webster unabridged




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