Meaning of (आत्मतत्त्वज्ञान) atmatattvagyan in english
As noun :
metaphysics Ex:  Aristotle’s metaphysics contains observations on the nature of numbers
Suggested : the branch of philosophy that treats of first principles, includes ontology and cosmology, and is intimately connected with epistemology
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(आत्मतत्त्वज्ञान) atmatattvagyan
can be used as noun.. No of characters: 15 including vowels consonants matras.
Transliteration :
aatmatattvaGYaana