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introductory /ˌɪntrəˈdʌktəri/  

  • adjective
    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
    providing basic information about a subject
    an introductory text
    a class in introductory physics
    intended to attract customers when a new product, service, etc., is introduced
    a special introductory offer/price