The definition of atman means the individual soul or essence, particularly in the Hindu religion.(noun)
A person who is entirely in touch with her spiritual side is an example of someone deeply connected to her atman.
See atman in Webster's New World College Dictionary
Origin: Sans ātm, breath, soul, Supreme Spirit < IE *ēt-men, breath > OE æthm, Ger atem
See atman in American Heritage Dictionary 4
Origin: Sanskrit ātman, breath, spirit.