the act or an instance of introducing or being introduced
a formal presentation of one person to another
a letter, etc introducing one person to another
something that introduces, e.g.:
a part of a book, lecture, etc that is preliminary to the main part
a book or course of study that gives a basic grounding in a subject
a book that teaches the basics of a subject
a short introductory musical passage
something introduced; specif a plant or animal new to an area
[Middle English introduccioun via French from Latin introduction-, introductio, from introducere: see introduce]