Where does “preintroductory” come from?

preintroductory (English) comes from English introductory, from Late Latin introductorius, from Latin introductus, from Latin intrōdūcō, from Latin intrō, from Latin intra, from Latin interus, from Proto-Indo-European h₁énteros — Contrastive or oppositional adjectival suffix.

preintroductory (English): Before the introduction of something

Definitions

Before the introduction of something

Ancestry of “preintroductory”, step by step

Step	Language	Word	Meaning
1	English	introductory	Introducing; giving a preview or idea of
2	Late Latin	introductorius	introductory
3	Latin	introductus	introduced
4	Latin	intrōdūcō	—
5	Latin	intrō	—
6	Latin	intra	within; inside; during; less than
7	Latin	interus	—
8	Proto-Indo-European	h₁énteros	inside, within
9	Proto-Indo-European	-teros	Contrastive or oppositional adjectival suffix

Every word from Proto-Indo-European -teros →