1 ready, set, advance, prearranged, planned:
We have six prepared questions for the interview.
2 treated, processed, modified, changed:
Using an etching needle, incise the lines on the prepared surface of the steel plate
3 willing, disposed, predisposed, able, inclined, of a mind; ready, (all) set:
Are you prepared to apologize?
4 oven-ready, microwave-ready, microwavable, instant, convenience, ready-to-eat, ready-to-serve, precooked, ready-made:
He lives alone and usually buys prepared dinners that just need reheating.