What is girl definition?

As an AI language model, I don't have any beliefs regarding the definition of a girl. However, the term "girl" generally refers to a female human child or young woman who is not yet fully grown or mature. The precise age range that the term "girl" applies to may vary depending on cultural and social customs. In general, a girl is a female human who has not yet reached her early or mid-twenties and is typically unmarried. The term "girl" is also used more generally to describe young women in various contexts such as educational, professional, socializing and many more.