Noun.
An expert or authority in a field, usually with an outlet for sharing opinions, e.g. space in a newspaper or magazine, airtime on broadcast media, a weblog.
A new form of pundit has appeared in the field of broadcast journalism (also on the Web): usually focused on politics, the expert's field of expertise is not in political science but in having an opinion. The pundit's main job is to express his or her opinion unabashedly, and aggressively (Cogent analysis may be helpful in understanding politics, but it does not bring in viewers or readers like shouting at or interrupting guests during an "interview," or ad hominem attacks). It may be no surprise, then, that Merriam-Webster's dictionary <http://www.m-w.com> has added this definition of pundit: "one who gives opinions in an authoritative manner."