(transitive) To form or collect into a mass; to form into a collective body; to bring together into masses; to assemble. / (intransitive) To have a certain mass.

Involving a mass of things; concerning a large quantity or number. / Involving a mass of people; of, for, or by the masses.

(Christianity) The Eucharist, now especially in Roman Catholicism. / (Christianity) Celebration of the Eucharist. / (Christianity, usually as the Mass) The sacrament of the Eucharist.

(intransitive, obsolete) To celebrate mass.

(Roman Catholic Church) The principal liturgical service of the Church, including a scripture service and a eucharistic service, which includes the consecration and oblation (offering) of the host and wine.

present participle of mass

A bringing together into a mass.

The quality of being a part of a mass. / (linguistics, of a noun) The quality of being a mass noun.

A surname from French.

simple past tense and past participle of mass