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Adjective: introductory  ,in-tru'dúk-t(u-)ree
  1. Serving to open or begin
    "began the slide show with some introductory remarks"
     
  2. Serving as a base or starting point
    "an introductory art course";
    - basic
     
  3. Serving as an introduction or preface
    "The introductory remarks of the author lacked detail";
    - prefatorial, prefatory

See also: 1st, first, opening, preceding