WordNet (r) 3.0 (2006):

common knowledge
    n 1: anything generally known to everyone

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "common knowledge":
   PR, accessible, affirmed, announced, ballyhoo, blurb, bright light,
   broadcast, brought to notice, celebrity, circulated,
   common property, cry, currency, current, daylight, declared,
   diffused, disseminated, distributed, eclat, exposure, fame,
   famousness, glare, hoopla, hue and cry, in circulation, in print,
   limelight, made public, maximum dissemination, notoriety, open,
   plug, press notice, proclaimed, propagated, public, public eye,
   public knowledge, public relations, public report, publicity,
   publicity story, publicness, published, puff, reclame, report,
   reported, spotlight, spread, stated, telecast, televised,
   write-up