Enlightenment == 觉悟
"Enlightenment" sometimes refers to the attainment of Buddhahood, as the "Enlightened One" means Buddha. If one is enlightened, one has a complete and perfect understanding of the reality character of everything.
Three Enlightenments == 三觉
the three kinds of Enlightenment:
1.Enlightenment for self
2.Enlightenment for others
3.Perfect enlightenment and accomplishment
The first is Arhat. The second is Bodhisattva. When all the three have been attained, the being becomes a Buddha.
bojjhanga == 七觉支
Five Vehicles == 五乘(人、天、声闻、缘觉、菩萨)
The Five Vehicles conveying the karma-reward which differs according to the vehicle:
1.Human Vehicle - rebirth among human conveyed by observing the Five Commandments (Five Precepts)
2.Deva Vehicle - among the devas by the Ten Forms of Good Actions (Ten Wholesomeness)
3."Sound-Hearing" Arhat - among the sravakas by the Four Noble Truths
4."Enlightened by Conditions" Arhat - among the pratyeka-buddhas by the Twelve Nidanas
5.Bodhisattva - among the Bodhisattvas by the Six Paramita