introductory

Of, relating to, or constituting an introduction; initial or preparatory: synonym: preliminary.

Serving to introduce something; prefatory; preliminary: as, introductory remarks.

Synonyms Preparatory, etc. (see preliminary); precursory, proëmial.

An introduction; a treatise giving the elements or simplest parts of a subject.

Serving to introduce something else; leading to the main subject or business; preliminary; prefatory

introducing; giving a preview or idea of

serving as an introduction or preface

serving as a base or starting point

serving to open or begin