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Definition of introduction : 1. 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.
2. That part of a book or discourse which introduces or leads the way to the main subject, or part; preliminary; matter; preface; proem; exordium.
3. 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.
4. The act of introducing, or bringing to notice.

Synonyms:

invention, door, be/become (a) legend, basis, manual, onset, assimilation, presentation, body, debut, lead-in, entryway, education, introduce, entranceway, primer, inlet, first appearance, influx, insight, instauration, entering, words, awakening, foundation garment, enlightenment, gateway, design, creative activity, arrival, substructure, discovery, presentment, see, flashcard, meeting, induction, submission, launch, advanced, adit, psychiatric hospital, hothouse, exploratory, initiation, intromission, trigger, asylum, acquisition, installation, grammar, entrance, appendix, foot, grounding, be remembered as someone/for (doing) something, cornerstone, afterword, entry, starting point, accession, insane asylum, incoming, balance of trade, display, interpolation, prolusion, mental institution, access, launching, come on, foreword, come across, approach, cosmos, innovation, groundwork, bump into, book, meet up, baptism, exordium, handbook, appearance, entree, ingression, macrocosm, origination, run into, fundament, exercise, have the world at your feet, institution, mental hospital, existence, export, admittance, text, binding, doorway, admission, addendum, acknowledgments, meet, world, knowledgeableness, ingress, excogitation, founding, knowledgeability, base, unveiling, proem, gate, intro, prolegomenon, elements, encounter, accounting entry, blockade, balance of payments, universe, embargo, artwork, outset, accept, back, be noted for, mental home, be a household name/word, common market, ledger entry, portal, understructure, present, foundation, survey, demonstration, blurb, establishment

commencement, conception, nativity, derivation, dawn, embryo, beginning, Genesis, hatching, preparation, stem, inauguration, creation, precursor, inception, earliness, sprout, cradle, infancy, origin, source, spring, start, nascency, babyhood, emergence, birth

overture, opening, preamble, preface, prologue, forward

foregoing, avant-garde, leading, preceding, prelude, antecedent

injection, implantation, penetration, insinuation, lodgement, interlocation, infiltration, intrusion, insertion, embedding, piercing

Usage examples:

• John gave me a letter of introduction, but I have been so busy since my arrival here I have had no chance to call on you. - "The Lost Despatch", Natalie Sumner Lincoln.
• 326; what would be that of its introduction into Geneva, i. - "Rousseau Volumes I. and II.", John Morley.
• For a sound appreciation of this cheese see Clifton Fadiman's introduction to this book. - "The Complete Book of Cheese", Robert Carlton Brown.