Markdown (noun)

1. A reduction in the price of goods or services.
2. A simple markup language used to format text on the web and in plain text documents, often used to format readme files, messages, and comments.

Origin:

The term is derived from the act of marking down the price of goods.

Examples:

1. The store had a markdown on winter clothing.
2. This document is written in markdown format, which can be easily converted to HTML.
3. The markdown syntax allows for headings, lists, links, and other formatting options.
4. Many websites and applications support markdown formatting for user-generated content.
5. The markdown language is designed to be easy to read and write.