A large or general assembly of people, usually a meeting having some relation to politics.(noun)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "mass meeting" in a sentence
"Having made up his mind so far, Richard came up to the big mass meeting of Labour in the great Canberra Hall, in Sydney."
"What actually took place was a mild mass meeting on Kennington Common, well kept within the bounds of decorum by an army of citizen police."
"Mrs. Stanton and I sent out a call for a mass meeting in Dr. Cheever's church, New York, where the Woman's Loyal League was formed, on May 14th, 1863."