The ability to acquire and apply skills and knowledge.

The ability to make appropriate decisions and take appropriate actions in the face of uncertainty. The word ‘appropriate’ is best characterized in context, and with reference to the task at hand. For example, some tasks require that appropriate action maximize efficiency while others may emphasize learning, survivability, robustness, or an ability to communicate. Ultimately, intelligence is in the eye of the beholder. “We know it when we see it.”