1. Serving to introduce something else; preliminary.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• introductoy,
• intoductory,
• introducton,
• introductury,
• introductary,
• introguctory,
• intruductory,
• intorductory,
• intrductory,
• introdcutory,
• introductery,
• introdactory,
• indroductory,
• intriductory,
• intoductery,
• inroductory,
• introductry,
• interductory,
• introdutary,
• introdoctry

• interoceptor,
• contradictory,
• introject,
• introduce,
• introduction,
• intragroup,
• introspection,
• introspect.

The adjective form of the word "introductory" is "introductory".

The plural form of the word "introductory" is "introductory".

The singular form of the word "introductory" is "introduction"