introductionintroduction

Introduction comes from Old French introduction, from Latin intrōdūctiō, from intrōdūcō ‘to lead in’, from dūcō ‘to lead’, ultimately from Proto-Indo-European *dewk-.

1. Proto-Indo-Europeanc. 4500–2500 BCE*dewk-¹‘to pull’reconstructed
2. Proto-Indo-Europeanc. 4500–2500 BCE*déwkti¹‘to pull’reconstructed
3. Proto-Italicc. 1500–700 BCE*doukō¹‘to lead’reconstructed
4. Latinc. 75 BCE–200 CEdūcō¹‘to lead’
5. Latinc. 75 BCE–200 CEintrōdūcō²‘to lead in: to conduct into’
6. Latinc. 75 BCE–200 CEintrōdūctiō²‘a leading in, introduction’
7. Old Frenchc. 842–1400introduction²
8. Middle Englishc. 1150–1500introduccioun²
9. Englishtodayintroduction²

1. ¹ Wiktionary, Latin introduco
2. ² Wiktionary, English introduction