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Children's Dictionary
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motive an idea, need, desire, or impulse that causes a person to act in a particular way or do a particular thing; reason.
motor a machine that causes motion or power. [4 definitions]
motorboat a boat that works by means of a motor.
motorcycle a vehicle with two wheels, a heavy frame, and an engine.
motor scooter a light, two-wheeled, gas-powered vehicle with two small wheels and a seat over the engine for the driver.
motorway a British word for a major public road on which one can drive at high speeds. "Motorway" often has the same meaning as "highway" or "expressway."
motto a short saying used as a reminder of a belief or rules of behavior.
moulding a spelling of "molding" used in Canada and Britain. See "molding" for more information.
mound a raised pile; heap. [3 definitions]
mount1 to climb. [7 definitions]
mount2 a mountain or high hill.
mountain a land mass with great height and steep sides that is higher than a hill. [2 definitions]
mountaineer a person who climbs mountains for sport. [2 definitions]
mountain lion a common name for a puma, a large wild cat with tan fur. Mountain lions live in many parts of North and South America. They are carnivorous mammals. Mountain lions are also called cougars or panthers.
mountainous having many mountains. [2 definitions]
mountain range a group of connected mountains that were formed during the same time period.
Mount Everest the world's highest mountain, on the border between Nepal and Tibet. Mount Everest is part of the Himalayan range of mountains that lie between India and China. In Tibet, the mountain is called Chomolungma. In Nepal, it is called Sagarmatha.
mourn to feel or act very sad because of a death or great loss; grieve. [2 definitions]
mourning acts or feelings that express great sadness. [2 definitions]
mouse a very small mammal with gray or brown fur. Mice are rodents. They have pointed faces, round ears, and long tails with no fur. Different kinds of mice are found in many parts of the world. [2 definitions]
moustache another spelling of mustache.