'Enlightenment Being', is a being destined to Buddha-hood, a future Buddha.
According to the traditional belief a Bodhisatta, before reaching his last birth as a Buddha on this earth, is living in the Tusita-heaven (s. deva), the heaven of bliss. Cf. A. IV, 127; VIII, 70.
In the Pāli Canon and commentaries, the designation 'Bodhisatta' is given only to Prince Siddhattha before his enlightenment and to his former existences.
The Buddha himself uses this term when speaking of his life prior to enlightenment (e.g. M.4, M.26).
Bodhisatta-hood is neither mentioned nor recommended as an ideal higher than or alternative to Arahantship; nor is there any record in the Pāli scriptures of a disciple declaring it as his aspiration.
See bodhi and the Pail Names Dic.