A coherent, typically large body of matter with no definite shape.
The mass of the iceberg was visible from miles away.
A large number of people or objects crowded together.
A mass of protesters gathered in the city square.
The quantity of matter that a body contains, as measured by its acceleration under a given force or by the force exerted on it by a gravitational field.
The mass of the object was calculated using a balance scale.
A celebration of the Eucharist in the Roman Catholic Church or certain other Christian churches.
The family attended Mass every Sunday morning.
A large amount or quantity of something.
There was a mass of evidence against the suspect.
The people in society considered as a whole, especially the general public; usually used with the definite article.
The mass of the population had little influence on government policy.
massverb
To come together in a large group or crowd.
Protesters began to mass in the city square.
To gather or accumulate in large quantities.
Clouds massed on the horizon, signaling an approaching storm.
massadjective
Involving, affecting, or produced for a large number of people or things; large-scale.
Mass vaccination campaigns helped control the outbreak.
Relating to the physical property of mass in scientific contexts.
Mass spectrometry provides detailed information about the mass distribution of molecules.