wavelength
noun
                                                                                                                            
                                                            wave·length
                    
                                                                                                              
                                                                                                                                  ˈwāv-ˌleŋ(k)th  
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : the distance in the line of advance of a wave from any one point to the next point of corresponding phase                                      
                
                    
2
                    
                                          
              
          
                                                      : a particular course or line of thought especially as related to mutual understanding                                      
              
                             
two people on different wavelengths
                         
                
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  Merriam-Webster unabridged




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