| mass | | |
| n. (attribute) | 1. mass | the property of a body that causes it to have weight in a gravitational field. |
| ~ physical property | any property used to characterize matter and energy and their interactions. |
| ~ body | the main mass of a thing. |
| ~ biomass | the total mass of living matter in a given unit area. |
| ~ critical mass | the minimum mass of fissionable material that can sustain a chain reaction. |
| ~ rest mass | (physics) the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body. |
| ~ relativistic mass | (physics) the mass of a body in motion relative to the observer: it is equal to the rest mass multiplied by a factor that is greater than 1 and that increases as the magnitude of the velocity increases. |
| ~ bulk | the property possessed by a large mass. |
| ~ gravitational mass | (physics) the mass of a body as measured by its gravitational attraction for other bodies. |
| ~ inertial mass | (physics) the mass of a body as determined by the second law of motion from the acceleration of the body when it is subjected to a force that is not due to gravity. |
| ~ atomic mass, atomic weight, relative atomic mass | (chemistry) the mass of an atom of a chemical element expressed in atomic mass units. |
| ~ mass energy | (physics) the mass of a body regarded relativistically as energy. |
| ~ molecular weight, relative molecular mass | (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule. |
| ~ mass defect, mass deficiency | the amount by which the mass of an atomic nucleus is less than the sum of the masses of its constituent particles. |
| ~ fundamental measure, fundamental quantity | one of the four quantities that are the basis of systems of measurement. |
| n. (quantity) | 2. 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 of journalists"; "a wad of money" |
| ~ large indefinite amount, large indefinite quantity | an indefinite quantity that is above the average in size or magnitude. |
| ~ deluge, flood, inundation, torrent | an overwhelming number or amount.; "a flood of requests"; "a torrent of abuse" |
| ~ haymow | a mass of hay piled up in a barn for preservation. |
| n. (group) | 3. mass | an ill-structured collection of similar things (objects or people). |
| ~ aggregation, collection, accumulation, assemblage | several things grouped together or considered as a whole. |
| ~ logjam | an immovable mass of logs blocking a river. |
| ~ shock | a bushy thick mass (especially hair).; "he had an unruly shock of black hair" |
| n. (act) | 4. mass | (Roman Catholic Church and Protestant Churches) the celebration of the Eucharist. |
| ~ religious ceremony, religious ritual | a ceremony having religious meaning. |
| ~ high mass | a solemn and elaborate Mass with music. |
| ~ low mass | a Mass recited without music. |
| ~ requiem | a Mass celebrated for the dead. |
| ~ church of rome, roman catholic church, roman church, western church, roman catholic | the Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy. |
| ~ protestant church, protestant | the Protestant churches and denominations collectively. |
| n. (object) | 5. mass | a body of matter without definite shape.; "a huge ice mass" |
| ~ body | an individual 3-dimensional object that has mass and that is distinguishable from other objects.; "heavenly body" |
| ~ coprolith, faecalith, fecalith, stercolith | a hard mass of fecal matter. |
| ~ drift | a large mass of material that is heaped up by the wind or by water currents. |
| ~ mat | a mass that is densely tangled or interwoven.; "a mat of weeds and grass" |
| ~ mush, pulp | any soft or soggy mass.; "he pounded it to a pulp" |
| n. (group) | 6. hoi polloi, mass, masses, multitude, people, the great unwashed | the common people generally.; "separate the warriors from the mass"; "power to the people" |
| ~ group, grouping | any number of entities (members) considered as a unit. |
| ~ laity, temporalty | in Christianity, members of a religious community that do not have the priestly responsibilities of ordained clergy. |
| ~ audience | the part of the general public interested in a source of information or entertainment.; "every artist needs an audience"; "the broadcast reached an audience of millions" |
| ~ followers, following | a group of followers or enthusiasts. |
| n. (attribute) | 7. bulk, mass, volume | the property of something that is great in magnitude.; "it is cheaper to buy it in bulk"; "he received a mass of correspondence"; "the volume of exports" |
| ~ magnitude | the property of relative size or extent (whether large or small).; "they tried to predict the magnitude of the explosion"; "about the magnitude of a small pea" |
| ~ dollar volume, turnover | the volume measured in dollars.; "the store's dollar volume continues to rise" |
| n. (communication) | 8. mass | a musical setting for a Mass.; "they played a Mass composed by Beethoven" |
| ~ high mass | a solemn and elaborate Mass with music. |
| ~ church music, religious music | genre of music composed for performance as part of religious ceremonies. |
| ~ requiem | a musical setting for a Mass celebrating the dead. |
| n. (communication) | 9. mass | a sequence of prayers constituting the Christian Eucharistic rite.; "the priest said Mass" |
| ~ prayer | a fixed text used in praying. |
| v. (motion) | 10. mass | join together into a mass or collect or form a mass.; "Crowds were massing outside the palace" |
| ~ press | crowd closely.; "The crowds pressed along the street" |
| ~ crowd together, crowd | to gather together in large numbers.; "men in straw boaters and waxed mustaches crowded the verandah" |
| adj. | 11. aggregate, aggregated, aggregative, mass | formed of separate units gathered into a mass or whole.; "aggregate expenses include expenses of all divisions combined for the entire year"; "the aggregated amount of indebtedness" |
| ~ collective | forming a whole or aggregate. |
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