n A learned person in India; someone with knowledge of Sanskrit, philosophy, religion and law; a Hindu scholar. (defdate|from 17th c.)
n (historical) A native surveyor in British India, trained to carry out clandestine surveillance beyond British borders.
n A self-professed expert in a particular field, especially as called upon to provide comment or opinion in the media; a commentator, a critic. (defdate|from 19th c.)