introductory
adjective
                                                                                                                            
                                                            in·tro·duc·to·ry
                    
                                                                                                              
                                                                                                                                  ˌin-trə-ˈdək-t(ə-)rē  
                                                      
                                                          
            
                                
              
          
                                                      : of, relating to, or being a first step that sets something going or in proper perspective                                      
              
                             
an introductory course in calculus
                         
                
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  Merriam-Webster unabridged




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