Definitions
1.NounAn expert in a particular field, especially as called upon to provide comment or opinion in the media; a commentator, a critic. .mw-parser-output .defdate{font-size:smaller}
2.NounA learned person in India; someone with knowledge of Sanskrit, philosophy, religion and law; a Hindu scholar.
3.NounA native surveyor in British India, trained to carry out clandestine surveillance beyond British borders.