Where does “introductive” come from?

introductive (English) comes from English introduce, from English introduction, from Middle English introduccioun, from Old French introduction, from Latin introductionem, from Latin intrōductiō, from Latin intrōdūcō, from Latin intrō — Contrastive or oppositional adjectival suffix.

introductive (English): Of, pertaining to, or serving as an introduction

Definitions

Of, pertaining to, or serving as an introduction

Ancestry of “introductive”, step by step

Step	Language	Word	Meaning
1	English	introduce	To cause to be acquainted; To make known by...
2	English	introduction	The act or process of introducing; A means, such...
3	Middle English	introduccioun	—
4	Old French	introduction	—
5	Latin	introductionem	accusative singular of intrōductiō
6	Latin	intrōductiō	—
7	Latin	intrōdūcō	—
8	Latin	intrō	—
9	Latin	intra	within; inside; during; less than
10	Latin	interus	—
11	Proto-Indo-European	h₁énteros	inside, within
12	Proto-Indo-European	-teros	Contrastive or oppositional adjectival suffix

Every word from Proto-Indo-European -teros →