definition of
Mass

[1] #1 Mass n. [mass] the property of a body that causes it to have weight in a gravitational field. wn

[2] #2 Mass n. [batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad] (often followed by 'of') a large number or amount or extent; "a batch of letters"; "a deal of trouble"; "a lot of money"; "he made a mint on the stock market"; "see the rest of the winners in our huge passel of photos"; "it must have cost plenty"; "a slew. wn

[3] #3 Mass n. [mass] an ill-structured collection of similar things (objects or people). wn

[4] #4 Mass n. (Roman Catholic Church and Protestant Churches) the celebration of the Eucharist. wn

[5] #5 Mass n. [mass] a body of matter without definite shape; "a huge ice mass". wn