1. noun /mæs,mæs/
a) The Eucharist, now especially in Roman Catholicism.
And if it were not for theſe Principles the Bodies of the Earth, Planets, Comets, Sun, and all things in them would grow cold and freeze, and become inactive Maſſes ; .
b) Celebration of the Eucharist.
and because a deep mass of continual sea is slower stirred to rage.
2. verb /mæs,mæs/
a) To form or collect into a mass; to form into a collective body; to bring together into masses; to assemble.
They would unavoidably mix up the whole of these declarations, and mass them together, although the Judge might direct the Jury not to do so.
b) To have a certain mass.
Every bend on the hill had acted like a funnel to mass them together in this peculiar way.
3. adjective /mæs,mæs/
a) Involving a mass of things; cencerning a large quantity or number.
There is evidence of mass extinctions in the distant past.
b) Involving a mass of people; of, for, or by the masses.
The national liberation movement had not yet developed to a sufficiently mass scale.
Wikipedia foundation.