Enlightenment is well-defined and described in detail by the Buddhist cannon. You can call “enlightenment” whatever you want, but Buddha taught a specific conception of enlightenment and a specific path to achieving it.
The Tripitaka describes enlightenment proceeding in four stages (SN 22.122), with each stage defined by the abandonment of some of the ten fetters (SN 45.179 and 45.180) which bind us to samsara. Once the ten fetters are conquered one has reached the final stage of enlightenment and will be liberated from the cycle of rebirth (nirvana).
The Tripitaka describes each fetter in detail and how to overcome them. The process of enlightenment is fairly systematic (eightfold path).
The ten fetters are:
1. Self identity view (sakkaya ditthi)
2. Sceptical doubt (vicikicca)
3. Attachment to mere rites and rituals (silabbata paramasa)
4. Sensual desire (kama raga)
5. Ill-will (patigha)
6. Desire to be born in fine material worlds (rupa raga)
7. Desire to be born in formless worlds (arupa raga)
8. Conceit (mana)
9. Restlessness (uddacca)
10. Ignorance (avijja)