Terms

Slate is an object-oriented language, and as such works with some terms worth describing initially for clarity:

Object

some thing in the system that can be identified.

Method

some behavior or procedure that is defined on some objects or class of objects.

Message

the act of requesting a behavior or procedure from some objects, the message's arguments.

Selector

the name of a method or a message-send.

Inheritance

a relationship between objects that confers the parent's behavior on the child.

Dispatch

the process of determining, from a message-send, what method is appropriate to invoke to implement the behavior.