Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “mass”

See all translations

mass

adjective [before noun] uk   /mæs/ us  
C1 having an effect on or involving a large number of people or forming a large amount: weapons of mass destruction a mass murderer mass starvation Opposition groups plan to stage mass demonstrations all over the country.
More examples

mass

noun uk   /mæs/ us  

mass noun (LARGE AMOUNT)

B2 [S] a large amount of something that has no particular shape or arrangement: The explosion reduced the church to a mass of rubble. The forest is a mass of colour in autumn.masses [plural] UK informal B2 a lot: [+ to infinitive] I've got masses to do at the weekend. There were masses of people in town today.the mass of sth most of something: The mass of the people support the reforms.
More examples

mass noun (SOLID LUMP)

[C] a solid lump with no clear shape: The sauce was now a sticky mass at the bottom of the pan.

mass noun (ORDINARY PEOPLE)

the masses the ordinary people who form the largest group in a society: He was popular with the rich but failed to win the support of the masses.

mass noun (PHYSICS)

[C] specialized physics the amount of matter in any solid object or in any volume of liquid or gas: The acceleration of a body equals the force exerted on it divided by its mass.mass number the total number of protons and neutrons in an atommass defect the difference between the mass of a nucleus (= central part of an atom) and the mass of the separate pieces that make up the nucleus

mass noun (RELIGIOUS CEREMONY )

[C or U] ( also Mass) a religious ceremony in some Christian Churches based on Jesus' last meal with his disciples, or music written for parts of this ceremony: to go to Mass
See also

mass

verb [I] uk   /mæs/ us  
to come together in large numbers: Thousands of troops have massed along the border in preparation for an invasion.
(Definition of mass from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of mass?
Add Cambridge dictionaries to your browser to your website

Definitions of “mass” in other dictionaries

Word of the Day

cold snap

a short period of cold weather

Word of the Day

Cleavage proves divisive in Cambridge’s words of 2014

by Alastair Horne,
December 19, 2014
​​​​ Other dictionaries may choose faddish novelties as their words of the year, but here at Cambridge, we like to do something different. We look for the words that have seen sudden surges in searches over the course of the year – words that have been baffling users of English and driven them

Read More 

cinderella surgery noun

December 15, 2014
cosmetic surgery to the feet We have all heard of people having nose jobs, boob jobs and liposuction – but now a new trend growing in popularity in America: Cinderella surgery.

Read More