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Mass \Mass\ (m[.a]s), n. [OE. masse, messe, AS. m[ae]sse. LL.
missa, from L. mittere, missum, to send, dismiss: cf. F.
messe. In the ancient churches, the public services at which
the catechumens were permitted to be present were called
missa catechumenorum, ending with the reading of the Gospel.
Then they were dismissed with these words : ``Ite, missa
est'' [sc. ecclesia], the congregation is dismissed. After
that the sacrifice proper began. At its close the same words
were said to those who remained. So the word gave the name of
Mass to the sacrifice in the Catholic Church. See {Missile},
and cf. {Christmas}, {Lammas}, {Mess} a dish, {Missal}.]
1. (R. C. Ch.) The sacrifice in the sacrament of the
Eucharist, or the consecration and oblation of the host.

2. (Mus.) The portions of the Mass usually set to music,
considered as a musical composition; -- namely, the Kyrie,
the Gloria, the Credo, the Sanctus, and the Agnus Dei,
besides sometimes an Offertory and the Benedictus.

{Canon of the Mass}. See {Canon}.

{High Mass}, Mass with incense, music, the assistance of a
deacon, subdeacon, etc.

{Low Mass}, Mass which is said by the priest throughout,
without music.

{Mass bell}, the sanctus bell. See {Sanctus}.

{Mass book}, the missal or Roman Catholic service book.