Rav
Rav or Rab (Hebrew: רב) is the Hebrew generic term for a teacher of Torah or other spiritual guide. For example, Pirkei Avot (1:6) states that: (..) Joshua ben Perachiah says, ″Set up a teacher [RaB] for yourself. And get yourself a friend [HaBeR]. And give everybody the benefit of the doubt.″
The term rav is also a Hebrew word for a rabbi. (For a more nuanced discussion see semicha.) The term is also frequently used by Orthodox Jews to refer to one's own rabbi.
In modern times, since the term rabbi has become commonplace and oft-used, the term rav has come to connote a rabbi with a much greater level of knowledge, wisdom, and understanding in Torah matters, above and beyond what has come to be known as a 'career rabbi' who, for example, conducts significant life events as his salaried job, rather than a person who studies and delves into Torah full-time for no reward or compensation.
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