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Look up mass in Wiktionary, the free dictionary.

Mass is the quantity of matter in a physical body and a measure of the body's inertia.

Mass or Maß may also refer to:

Arts, entertainment, and media

Mass (2004 film), Indian Telugu-language film
Mass, Hindi title of the 2015 Indian Tamil-language film Massu Engira Masilamani
Mass (2021 film), American drama film
Mass (novel), a 1973 novel by Filipino author F. Sionil José
Mass media, communication channels which can reach huge numbers of people
The Masses, a socialist magazine published in the US from 1911 to 1917

MASS (decoy system), a naval defence system
M26 Modular Accessory Shotgun System (or MASS), a developmental shotgun for the M16 rifle/M4 carbine family of guns
MASS, Marine Air Support Squadrons within the United States Marine Corps

Mass City, Michigan, also known as Mass, an unincorporated community in the United States
Maß (Lauer) (pronounced "mass"), a river of Bavaria, Germany, left tributary of the Lauer
Massachusetts (abbreviated Mass or MA), a U.S. state in New England
Massachusetts Bay (abbreviated Mass Bay), a bay off the U.S. state of the same name

Mass Party, a political party in Thailand (2006–2009?)
Mass society, a society based on relations between huge numbers of people, whose prototypical denizen is the "mass man"
Mass politics, politics in the mass society, featuring especially the modern political party

Mass (mass spectrometry), a chemical analysis technique
Autonomous cargo ship, also known as a Maritime Autonomous Surface Ships (MASS)
BrightBus, a former British vehicle body manufacturer and school bus operator that previously traded as MASS Engineering
Maß (pronounced "mass"), a German word describing the amount of beer in a regulation mug, also used for the mug itself
Manab Adhikar Sangram Samiti, a human rights NGO in Assam (India)
Marc and Eva Stern Math and Science School (Stern MASS)
Tumor, or mass, a neoplasm that is enlarged
Mass (object), a high-density object