Found in the following dictionaries
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Omerta" Definition
noun
A rule or code that prohibits speaking or divulging information about certain activities, especially the activities of a criminal organization.
Source: American Heritage Dictionary
foreign term
Conspiracy of silence.
Source: Merriam-Webster