The Collaborative International Dictionary of English v.0.48:

Atman \At"man\, n. [Skr. [=a]tman.] (Hinduism)
   (a) The life principle, soul, or individual essence.
   (b) The universal ego from whom all individual atmans arise.
       This sense is a European excrescence on the East Indian
       thought.
       [Webster 1913 Suppl.]