Definition of Brahmin:
In Hinduism, Brahman means “expansion” or “bud”, and its philosophical sense is that of the universal principle. It symbolizes the Ultimate Reality, or the Consciousness from which all reality is born.
In the main schools of Hindu philosophy, is the material and final cause of everything that exists. It is an eternal truth, infinite and pervasive that never changes, and that at the same time is the cause of all changes. Brahman is the singularity and fundamental part of all existence.
Brahman in the non-dualistic school of Advaita Vedanta is omnipresent and lives within each being.