Memorization and definitions go hand in hand. After all, you need a certain amount of memory to understand that epi means 'upon' or that mono means 'alone'. If I retain that, is it my understanding, or my memory?

That leads me to my next point, which is Anki is best used when you do what's called rote-memorization, but memorize simpler aspects -- so have one card that asks what does 'upon' mean in Greek, and another asking what 'mono' means in Greek - in addition to making more general questions regarding this subject.