Tortilla or Frittata?

Leaving aside the Mexican flat bread which is also called tortilla, both names describe large omelettes that are cooked all the way through and allowed to cool to room temperature before being cut into wedges. The only difference is that one is Spanish and the other Italian, and for some reason frittata is now a more fashionable name.

This version is flavoured with basil, grated Parmesan cheese and spring onions, and differs in execution by being cooked in two stages.