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Meaning of tat tvam asi*

tat tvam as•i

Pronunciation: (tat' tvam' as'ē, tut' twum' us'ē), [key]
— Sanskrit. Sanskrit.
  1. Thou art That (the statement, in the Upanishads, that Atman is identical with Brahman).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.