The Buddhists have a good definition of enlightenment: Our nature is “Pure Consciousness” or “Nature of Mind”, and when this pure and clear awareness explodes into experiences they call it “Everyday Mind”. The realisation of Pure Consciousness – Nature of Mind – is equal to enlightenment and there are no stages to be found.
When Nature of Mind is realised, which means that our identification is no longer with a separate “me” and we are fully established in Nature of Mind, we will know the Everyday Mind as consciousness with forms and names — what we call experiences. In Nature of Mind there are no stages; stages belong to the Everyday Mind.
To talk about stages of enlightenment is not a true teaching of Enlightenment.