noun.
The essence that is eternal, unchanging, and indistinguishable from the essence of the universe.
The Century Dictionary and Cyclopedia
noun.
The soul as it is conceived by the Brahman philosophers: the existence of it is denied by the Buddhists. The soul of the universe is equally called atman.
the GNU version of the Collaborative International Dictionary of English
noun.
The life principle, soul, or individual essence.
noun.
The universal ego from whom all individual atmans arise. This sense is a European excrescence on the East Indian thought.