collinear
adjective
                                                                                                                            
                                                            col·lin·ear
                    
                                                                                                              
                                                                                                                                  kə-ˈli-nē-ər  
                                                                                                                              
            kä-
                                                      
                                                          1
                    
                                          
              
          
                                                      : lying on or passing through the same straight line                                      
                
                    
2
                    
                                          
              
          
                                                      : having axes lying end to end in a straight line                                      
              
                             
collinear antenna elements
                         
                
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  Merriam-Webster unabridged




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