Buddhahood...

Bodhi (Sanskrit: बोधि) is both a Pāli and Sanskrit word traditionally translated as "enlightenment", but frequently (and more accurately) translated as "awakening" or "to know". The word "buddha" means "one who has awakened." Although its most common usage is in the context of Buddhism, bodhi is also a technical term, with various usages, in other Indian philosophies and traditions.

Etymology
Bodhi is an abstract noun formed from the verbal root budh (to awake, become aware, notice, know or understand,) corresponding to the verbs bujjhati (Pāli) and bodhati or budhyate (Sanskrit).

Evolution of the concept
In early Buddhism, bodhi carried a meaning synonymous to nirvana, using only some different metaphors to describe the experience, which implied the extinction of raga (greed), dosa (hate) and moha (delusion). In the later school of Mahayana Buddhism, the status of nirvana was downgraded, coming to refer only to the extinction of greed and hate, implying that delusion was still present in one who attained nirvana, and that one needed to attain bodhi to eradicate delusion [1]. Therefore, according to Mahayana Buddhism, the arhat has attained only nirvana, thus still being subject to delusion, while the bodhisattva not only achieves nirvana but full liberation from delusion as well.[citation needed] One thus attains bodhi and becomes a buddha. In Theravada Buddhism, bodhi and nirvana carry the same meaning, that of being freed from greed, hate and delusion. It should also be noted that in the Mahayana Mahaparinirvana Sutra, parinirvana is equal in all respects to Bodhi and indeed is the state of perfect Buddhahood.

In Theravada Buddhism
In Buddhism, bodhi means the awakening experience attained by Gautama Buddha and his accomplished disciples and refers to the unique consciousness of a fully liberated yogi. Bodhi is sometimes described as complete and perfect sanity, or awareness of the true nature of the universe. After attainment, it is believed that one is freed from the cycle of samsāra: birth, suffering, death and rebirth (see moksha). Bodhi is most commonly translated into English as enlightenment. This word conveys the insight and understanding (wisdom) possessed by a buddha and is similarly used in Christian mysticism to convey the saint's condition of being lit by a higher power - the merging of the human and the divine in theosis. There is no image of "light" contained in the term "bodhi", however. Rather, it expresses the notion of awakening from a dream and of being aware and knowing (reality). It is thus more accurate to think of bodhi as spiritual "awake-ness" or "awakenment", rather than "enlightenment" (although it is true that imagery of light is extraordinarily prevalent in many of the Buddhist scriptures).

Bodhi is attained when the ten fetters that bind a human being to the wheel of samsara have been dissolved; when the Four Noble Truths have been fully understood and all volitional conditioning has reached cessation (nirodha), giving rise to transcendent peace (nibbana). At this moment, the psychological roots of all greed (lobha), aversion (dosa), delusion (moha), ignorance (avijjā), craving (tanha) and ego-centered consciousness (attā) are completely uprooted.

Bodhi is the ultimate goal of Buddhist life (brahmacarya). It is achieved by observing the eightfold path, the development of the paramitas (virtues) and profound wisdom into the dependently arisen nature of phenomena..........from www.answers.com