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.]

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "atman":
   anima, anima humana, animating force, astral body, ba, bathmism,
   beating heart, biological clock, biorhythm, blood, breath,
   breath of life, buddhi, divine breath, divine spark, ego,
   elan vital, essence of life, force of life, gross body,
   growth force, heart, heartbeat, heartblood, impulse of life,
   inner man, inspiriting force, jiva, jivatma, kama, khu,
   life breath, life cycle, life essence, life force, life principle,
   life process, lifeblood, linga sharira, living force, manas, manes,
   mind, nephesh, physical body, pneuma, prana, principle of desire,
   psyche, purusha, ruach, seat of life, shade, shadow, soul,
   spark of life, spirit, spiritual being, spiritus, sthula sharira,
   the self, vis vitae, vis vitalis, vital energy, vital flame,
   vital fluid, vital force, vital principle, vital spark,
   vital spirit