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