Unlike many engaged situation with technology, this has offered me some insights and forward things. Thanks very much. Eric Flescher, Ed. Another candidate is AgentSheets. We're not talking about engagement being the subject of learning, but a component of the experience.
Engagement is the buzzword used to capture the affective experience of immersion in an interaction.
I've argued that if you align educational and engagement elements, they mutually reinforce to make an experience more effective and engaging than either alone. I'm happy to hear a better term, but to disparage it on these grounds seems facile.