"introductory" in the adjective sense
1. introductory
serving to open or begin
"began the slide show with some introductory remarks"
2. basic, introductory
serving as a base or starting point
"a basic course in Russian"
"basic training for raw recruits"
"a set of basic tools"
"an introductory art course"
3. introductory, prefatorial, prefatory
serving as an introduction or preface
Source: WordNet® (An amazing lexical database of English)
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