Meaning of Sanatman
सनात्मन् (Sanātman) = "The Eternal Self" & "One whose Self is eternal/constant".
The term "सनात्मन्" (Sanātman) is a compound Sanskrit construction, from:
1. सना (Sanā)
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Derived from the root सन् (san), meaning primordial, perpetuity, or constancy.
2. आत्मन् (Ātman)
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meaning the soul, or individual consciousness.
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In classical Sanskrit (and Vedānta), आत्मा is the indwelling spirit, distinct from body and mind — nitya (eternal), shuddha (pure), buddha (conscious), and mukta (free) by nature.