mass
US /mæs/
UK /mæs/
1.
2.
the quantity of matter which a body contains, as measured by its inertia
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The mass of an object determines its weight.
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Scientists are studying the mass of subatomic particles.
3.
4.
(often capitalized) the celebration of the Eucharist in the Roman Catholic Church
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They attended Mass every Sunday.
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The priest celebrated the morning Mass.
1.
assemble into a mass or groups
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The clouds began to mass on the horizon.
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The protesters massed outside the government building.
1.
relating to or involving large numbers of people or things
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The event attracted a mass audience.
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They launched a mass marketing campaign.