Introductory and Without number

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

Without number and introductory are semantically related. In some cases you can use "Without number" instead an adjective "Introductory".

Nearby Word: introduction

Introductory and without number are semantically related. Sometimes you can use "Introductory" instead an adjective phrase "Without number".