Meaning : Serving to open or begin.
Example :
Began the slide show with some introductory remarks.
Meaning : Serving as a base or starting point.
Example :
A basic course in Russian.
Basic training for raw recruits.
A set of basic tools.
An introductory art course.
Synonyms : basic
Meaning : Serving as an introduction or preface.
Synonyms : prefatorial, prefatory