Introduction

 1.
    the action of introducing something.
    "issues arising from the introduction of new technology"
    synonyms:    institution, establishment, initiation, launch, inauguration, foundation, instigation; More
    start, commencement, inception;
    development, origination, pioneering
    "the introduction of democratic reforms"
    antonyms:    abolition
        a thing newly brought into use or introduced to a place for the first time.
        plural noun: introductions
        "despite the new introductions, many of the older species remain firm favourites"
    2.
    a formal presentation of one person to another, in which each is told the other's name.
    "he returned to his desk, leaving Michael to make the introductions"
    synonyms:    presentation, formal presentation; More
    meeting, audience, interview, encounter
    "he wished for an introduction to the king"
    3.
    a thing preliminary to something else, especially an explanatory section at the beginning of a book, report, or speech.
    "your talk will need an introduction which states clearly what you are talking about and why"
    synonyms:    foreword, preface, preamble, prologue, prelude, front matter, lead-in; More
    opening, beginning, start, opening statement;
    informalintro, prelims, curtain-raiser;
    formalprolegomenon, proem, exordium, prolusion
    "he wrote an introduction to the catalogue"
    antonyms:    afterword, appendix
        a preliminary section in a piece of music, often thematically different from the main section.
        "his Fifth Symphony opens with an introduction featuring a solo tuba"
        a book or course of study intended to introduce a subject to a person.
        "a good general introduction to the subject is A Social History of England"
        synonyms:    basic explanation of, brief account of, description of; More
        the basics, the rudiments, the fundamentals, the groundwork
        "the handbook will include an introduction to the history of the period"
        a person's first experience of a subject or thing.
        "my introduction to drama was through an amateur dramatic society"
        synonyms:    initiation, induction, baptism, inauguration, debut
        "he had hoped for a gentle introduction to the life of the school"