Amitâbha. The Chinese perversion of the Sanskrit Amrita Buddha, or the “Immortal Enlightened”, a name of Gautama Buddha. The name has such variations as Amita, Abida, Amitâya, etc., and. is explained as meaning both “Boundless Age” and “Boundless Light”. The original conception of the ideal of an impersonal divine light has been anthrdpomorphized with time.
Source: H.P.Blavatsky - The Theosophical Glossary