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| Maul
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Heavy, long handled hammer which splits wood by either hitting it directly or using to hammer wedges into the wood. |
| Maximum contaminant level (mcl)
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The maximum level of a contaminant allowed in water by federal law. Based on health effects and currently available treatment methods. |
| Maximum developed horsepower
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If a motor is required to work harder than its idle speed, the motor is overloaded and must develop extra horsepower. The most horsepower that can be expected from a motor to handle this extra effort is referred to as its maximum developed horsepower. |
| Maximum financing
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Loan amount within 5 percent of the highest loan-to-value ratio allowable. |
| Maximum overall length (mol)
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The end-to end measurement of a lamp expressed in inches or millimeters. |
| Mean
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Measure of central tendency, that is a measure of the center of the data, also called an average. |
| Mean lumens
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The average light output of a lamp over its rated life. For fluorescent and metal halide lamps, mean lumen ratings are measured at 40% of rated lamp life. For mercury, high-pressure sodium and incandescent lamps, mean lumen ratings are measured at 50% of rated lamp life. |
| Mean power output (of a wind turbine)
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The average power output of a wind energy conversion system at a given mean wind speed based on a Raleigh frequency distribution. |
| Mean wind speed
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The arithmetic wind speed over a specified time period and height above the ground (the majority of U.S. National Weather Service anemometers are at 20 feet (6.1 meters). |
| Meander
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Descriptive of a property boundary that follows the course of a river or estuary. |
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