plural of Black Mass

A ritual, allegedly celebrated by witches, characterized by the inversion of the Traditional Latin Mass celebrated by the Roman Catholic Church.

(China, politics) The policy of consulting the masses, interpreting their suggestions within the framework of Marxism-Leninism, and then enforcing the resulting policies, as introduced by the Chinese Communist Party.

Communication directed to the mass of the people or through mass media. / The field of study concerning this.

plural of mass spectrometry

plural of relativistic mass

(crime) The shooting of multiple people over a short period of time, particularly when there are many victims and/or the victims are chosen indiscriminately.

plural of Planck mass

(physics) The unit of mass in the system of Planck units, defined as: m_P=√≈2.1765⨯10⁻⁸ mbox kg

(colloquial) mass spectrometer