introductory
1. [ adjective ] serving to open or begin
Examples:

"began the slide show with some introductory remarks"

Related terms: opening
2. [ adjective ] serving as a base or starting point
Synonyms: basic
Examples:

"a basic course in Russian" "basic training for raw recruits" "a set of basic tools" "an introductory art course"

Related terms: first
3. [ adjective ] serving as an introduction or preface
Synonyms: prefatory prefatorial
Related terms: preceding
Similar spelling:   introduction
  introduce
  introject
  introspection
  interoceptor
  introspect
  intragroup