Final answer:
The watchword 'invention' best characterizes the Industrial Revolution due to the technological innovations like the steam engine and power loom that defined the era.
Step-by-step explanation:
The best watchword for the Industrial Revolution would be invention. The Industrial Revolution was characterized by the creation of numerous ingenious machines like the steam engine, the power loom, and the steam locomotive, which revolutionized production processes and labor management. This period marked a significant transition from a focus on agriculture and handicrafts to the mass production of goods, primarily using machines. Technological innovation was at the heart of this epochal change.