in·tro·duc·tion
[in-truh-duhk-shuh
n] 
Show IPA–noun
1.
the act of introducing or the state of being introduced.
2.
a formal personal presentation of one person to another orothers.
3.
a preliminary part, as of a book, musical composition, or thelike, leading up to the main part.
4.
an elementary treatise: an introduction to botany.
5.
an act or instance of inserting.
6.
something introduced.
