Action

An action is a fundamental unit of Combat. Each actor is entitled to a certain number of actions, of certain types, each round; this sequence is called a "turn".

Definitions

Actor	A character, creature, or other entity controlled by a player or the GM.
Turn	A sequence of actions taken by an actor. Begins when the actor's Initiative comes up, ends when actor is out of actions, or forfeits remaining actions (also see Delay).
Round	A sequence of turns, one for each actor. Order of the turns is governed by Initiative.

Action Types

Type	# per Turn	Description	Typical Example	Conversion
Standard	1	The most major type, lasts a few seconds	An attack or offensive power	Move or swift
Swift	1	Quicker than standard, lasts a second or less	Drawing an item, using non-offensive power or maneuver	None
Move	1	About as long as standard, specific to movement	Movement (walking, piloting, etc)	None (but can use to draw/sheath an item)
Free	Unlimited¹	Either takes no time, or does not interfere with flow of combat	Talking (within reasonable limits), invoking powers with a single thought, changing Reserve configuration	None
Immediate	Unlimited²	Can be used outside of your turn	Automatic defenses (i.e. Dodge, Parry), Interrupts, any single action (if spending a Hero Point to interrupt)	None

¹: Free actions are unlimited within reason, but any given, specific kind of free action can only be used once per round by default.
²: There is no general limit on number of immediate actions used per round, but most immediate actions list their own specific restrictions.