Nouns

(n)introduction, debut, first appearance, launching, unveiling, entrythe act of beginning something new“they looked forward to the debut of their new product line”
(n)introductionthe first section of a communication
(n)presentation, introduction, introformally making a person known to another or to the public
(n)introductiona basic or elementary instructional text
(n)introductiona new proposal“they resisted the introduction of impractical alternatives”
(n)insertion, introduction, intromissionthe act of putting one thing into another
(n)initiation, founding, foundation, institution, origination, creation, innovation, introduction, instaurationthe 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”