What is a Guru? A dictionary defines it as:
gu·ru ( P ) Pronunciation Key (gr, g-r)
n. pl. gu·rus
Hinduism & Tibetan Buddhism. A personal spiritual teacher. A teacher and guide in spiritual and philosophical matters. A trusted counselor and adviser; a mentor.

A recognized leader in a field: the guru of high finance.
An acknowledged and influential advocate, as of a movement or idea: “In a culture that worships slimness, he was the Guru of Lean” (Erica Abeel).

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