the GNU version of the Collaborative International Dictionary of English
n. One who is curious to know everything that passes; one who knows, or pretends to know, all that is going on.
The Century Dictionary and Cyclopedia
n. One who is curious to know everything that passes, and is continually asking “What now?” or “What news?” hence, one who knows or pretends to know all that is going on in politics, society, etc.; a newsmonger.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a person who meddles in the affairs of others
Word Usage
"I love the word quidnunc, which means one who gossips because it is a word I could use to describe a lot of people who fit the definition and they wouldn't know what I was saying."