Some definitions from "meitar"1
A WORLD is recursively defined as: 1. A property of something, defined as everything it has, had or may have immediate interaction with.2. The worlds of all those things defined in #1, except itself.
INTERACTION: Any event that introduces change of its participants (axiom: we know what is an "event" and so it is not defined).
CHANGE: Every two states of any thing or entity are presumed to have a worldline between them; the process of movement of some thing or entity on that worldline is defined its "change".
PROCESS: either a single event or a set of two or more events following one another in sequence on the worldline.
ENTITY: Anything purpose-driven which may arbitrarily change, define or redefine that purpose without interacting with anything which is not itself or part of itself is called an entity (axiom: "purpose").
PREMEDITATION: The definition of one or multiple causes, reasons and, optionally, purposes for engagement in a process.
ACTION: Any premeditated process.
PURPOSE: Any terminating condition for an action, which is known in advance [incomplete definition]
CAUSE: Any event or process or feeling which serves as a setting condition for other events or a purpose. [incomplete definition] (axiom:feeling)
FEELING (strong): Any cause for things done by an entity, which have a purpose, is not an interaction of that entity with anything in its world and may persist after achievement of the purpose. [e.g. I hate someone-->I kill someone, but I still hate him after I kill him, as opposed to: I'm hungry-->I eat-->I'm no longer hungry]
FEELING (weak) Any cause for things done by an entity, which have a purpose, is not an interaction of that entity with anything in its world and does NOT persist after achievement of the purpose (e.g. I'm hungry-->I eat-->I'm no longer hungry).
1 A project whose stated purpose is to find discrepancies between declared and/or believed-in ideologies and actually practised beliefs and behavior and make appropriate adaptations of one to another and vice versa.