/ ˌɪntrəˈdʌktəri; NAmE / adjective
1.
written or said at the beginning of sth as an introduction to what follows
SYN opening :
introductory chapters / paragraphs / remarks
2.
intended as an introduction to a subject or an activity for people who have never done it before :
introductory courses / lectures
3.
offered for a short time only, when a product is first on sale :
a special introductory price of just $10
This introductory offer is for three days only.
••
WORD ORIGIN
late Middle English (as a noun denoting an introductory text): from late Latin introductorius , from Latin introducere , from intro- to the inside + ducere to lead.