Definition of Mafia
1 a
:a secret criminal society of Sicily or Italy
b
:a similarly conceived criminal organization in the U.S.;
also
:a similar organization elsewhere
- the Japanese Mafia
c
:a criminal organization associated with a particular traffic
- the cocaine Mafia
2
often not capitalized
:a group of people likened to the Mafia;
especially
:a group of people of similar interests or backgrounds prominent in a particular field or enterprise :clique
