Home › Words › I › insidernessinsidernessinsiderness means the quality of being an insider.EtymologyFrom insider + -ness.nounThe quality of being an insider.e.g.“The clipping of words is a harmless habit, used less for speed in spoken communication than for its sense of novelty or insiderness.” — 2009 May 24, William Safire, “Abbreve That Template”, in New York Times:Definitions & examples from Wiktionary (CC BY-SA 3.0).