introduction

introduction is a Noun

Definition:

[1] The act of introducing, or bringing to notice.

[2] The act of formally making persons known to each other; a presentation or making known of one person to another by name; as, the introduction of one stranger to another.

[3] That part of a book or discourse which introduces or leads the way to the main subject, or part; preliminary; matter; preface; proem; exordium.

[4] A formal and elaborate preliminary treatise; specifically, a treatise introductory to other treatises, or to a course of study; a guide; as, an introduction to English literature.