Action (n.) is the worldly and public capacity 'to bring the new, unexpected, and unanticipated into the world', to defy existing categories. Characterized by its ineliminable freedom.
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Action (n.) confronts us with the unforeseeable and the irreversible.
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Action (n.) is the capacity to make a new beginning, a miracle that interrupts the automatic run of the world.
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Action (n.) is absent from Kant: he knew sociability, communicability and the freedom of the pen, but neither a faculty nor a need for action.
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Action (n.) is never possible in solitude; one man alone needs at least the help of others to carry through his enterprise.