English definition of “mass”
LUMP [C] › a solid lump with no clear shape: The sauce was now a sticky mass in the bottom of the pan.
a mass of sth › a large amount or number of something: The garden was a mass of flowers. She had a mass of blond curls.
AMOUNT [U] › in physics, the amount of substance that something contains: One litre of water has a mass of one kilogram.
masses informal › a large amount or number of something: I've got masses of work to do. Take some of our paper - we've got masses.
the masses › the ordinary people who form the largest part of society: He failed to win the support of the masses.