declaration

A declaration is an expression where an identifier is introduced, along with its type. It may or may not be implemented (used), and it may or may not have a value assigned (initialized).

var name : type = expression is the syntax for the declaration of a variable. For example:

var PlayerSpeed : float = 2.0

This line of code declares that a variable named PlayerSpeed has a float value.

In this example, the last part, = 2.0, is the initialization, which is separate from the declaration.