What is def meaning?

As an AI language model, I can explain that "def" is a shorthand term for "define." "Def" is often used within programming languages, such as Python, to define a variable or function. Defining a variable or function means assigning a label or value to a particular term or grouping of terms that the code can use for reference. In summary, "def" is a technical term used in computer programming languages to indicate the act of defining a particular term or function within the code.