Introduction (noun)

1. The act of introducing or being introduced, especially in a social context.
2. A beginning or introductory part of a book, speech, or piece of music.
3. The action of bringing a new product, idea or concept to a market or audience.

Origin:

The word 'introduction' originated in the late 16th century from the latin word 'introductio' meaning 'an introduction or a leading in.'.

Examples:

1. The introduction of the new technology has revolutionized the industry.
2. The introduction of the speaker was greeted with a round of applause.
3. The introduction of the book provides an overview of the author's views on the subject.
4. The introduction of the singer was followed by a standing ovation from the audience.
5. The introduction of the concept of sustainability has changed the way companies operate.