If an action is small, it needs the help of various handmade objects. But when the action becomes great it can dispense with earthly objects. This is the first touchstone of action. ...
The second quality of action is its mobility. Like a whirlwind of primary matter, a true action must vibrate with possibilities. Only a flight can crown a luminous manifested thought.
The third quality of action is its unexpectedness. Every action which has astounded the minds of the people was the result of an unexpected way of thinking.
The fourth quality of action is its elusiveness. Only this quality protects the action against destructiveness.
The fifth quality of action is its convincingness. As every lightning flash connects our consciousness with the Cosmos, so each action should strike like a flashing sword.
The sixth quality of action is its lawfulness. Only the consciousness of the fundamentals of the world evolution can advance the action immutably.
The seventh quality of action is its pure motive. By this path one can move weighty loads without fatigue. (LMG II, p 197)

This definition is in context to Classic Yoga. See more contextual defintions for Action.