Initial (adjective)

1. Occurring at the start of a process or series of events.
2. Of or relating to the first letter of a name or word.

Origin:

Late middle english: from latin initialis, from initium "beginning".

Examples:

1. The initial stages of the project were the most challenging.
2. She was nervous about her initial job interview.
3. The company's initial public offering was a success.
4. His name is John, and the initial J is often used to address him.
5. She wrote her initial ideas down in her notebook.