Definition of "Mass" :

noun: (Roman Catholic Church and Protestant Churches) the celebration of the Eucharist

noun: the property of a body that causes it to have weight in a gravitational field

noun: the property of something that is great in magnitude

"He received a mass of correspondence."

noun: a sequence of prayers constituting the Christian Eucharistic rite

"The priest said Mass."

noun: a musical setting for a Mass

"They played a Mass composed by Beethoven."

noun: an ill-structured collection of similar things (objects or people)

noun: the common people generally

"Separate the warriors from the mass."

noun: a body of matter without definite shape

"A huge ice mass."

noun: (often followed by of') a large number or amount or extent

verb: join together into a mass or collect or form a mass

"Crowds were massing outside the palace."

adjective: formed of separate units gathered into a mass or whole