Introductory and Lead-in

Introductory adjective - Coming before the main part or item usually to introduce or prepare for what follows.

Lead-in and introductory are semantically related. in prefatory topic. In some cases you can use "Lead-in" instead an adjective "Introductory".

Nearby Word: introduction

Lead-in noun - The introductory section of a story.

Introductory and lead-in are semantically related. Sometimes you can use "Introductory" instead an adjective phrase "Lead-in".