introduction
noun
the act of beginning something new
“they looked forward to the debut of their new product line”
the first section of a communication
formally making a person known to another or to the public
a basic or elementary instructional text
a new proposal
“they resisted the introduction of impractical alternatives”
the act of putting one thing into another
the act of starting something for the first time; introducing something new
“she looked forward to her initiation as an adult”
“the foundation of a new scientific society”
Source: WordNet 3.1, Princeton University
