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Children's Dictionary
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massive having a very large amount of matter; big and heavy; solid. [2 definitions]
mass media those ways of communicating that reach large numbers of people, such as newspapers, magazines, television, and radio.
mass production the making of goods in large numbers by means of machines or assembly lines.
mass transit a system of public transportation that carries people from place to place within a city by bus and train.
mast1 a long upright pole that rises from the bottom of a sailboat or ship to support the sails and lines. [2 definitions]
master a person with power or control. [6 definitions]
master bedroom the largest bedroom in a home, or one with a special feature such as a fireplace or attached bathroom. A master bedroom is usually used by adults and not children.
masterful having or showing the skill of a master or expert.
masterly showing the ability or skill of a master; expert.
masterpiece a work of art of the highest quality. [2 definitions]
mastodon a very large extinct mammal. Several kinds of mastodons lived in Africa, Europe, Asia, and North America tens of thousands of years ago. The last kind of mastodon became extinct at the end of the last Ice Age. Mammoths and modern elephants may have developed from earlier mastodons.
mat1 a piece of material that is used as a covering to protect a floor or other surface. [6 definitions]
match1 a thin strip of wood or cardboard with a material on the end that burns when it is struck against something.
match2 a person or thing that is very like another. [6 definitions]
mate1 a marriage partner; husband or wife. [6 definitions]
material anything used for building or making something else. [4 definitions]
maternal of, having to do with, or like a mother. [2 definitions]
math short for "mathematics."
mathematical of or having to do with mathematics.
mathematician a person who works in mathematics.
mathematics (used with a singular verb) the study of numbers, amounts, shapes, and the relationship between them, using symbols to represent these things. Arithmetic, algebra, and geometry are some branches of mathematics.