Where does “introductorio” come from?
introductorio (Spanish) comes from Late Latin introductorius, from Latin introductus, from Latin intrōdūcō, from Latin intrō, from Latin intra, from Latin interus, from Proto-Indo-European h₁énteros, from Proto-Indo-European -teros — Contrastive or oppositional adjectival suffix.
introductorio (Spanish): introductory
Ancestry of “introductorio”, step by step