in·tro·duc·to·ry 
/ˌɪntrəˈdʌktəri/ adjective
/ˌɪntrəˈdʌktəri/ adjective 1 : providing information about someone who is about to speak, perform, etc., or something that is about to begin
▪ I'd like to make a few introductory remarks before we start the program. ▪ the book's introductory chapter 2 : providing basic information about a subject
▪ an introductory text ▪ a class in introductory physics 3 : intended to attract customers when a new product, service, etc., is introduced
▪ a special introductory offer/price
▪ I'd like to make a few introductory remarks before we start the program. ▪ the book's introductory chapter
▪ an introductory text ▪ a class in introductory physics
▪ a special introductory offer/price
