M
m	Symbol for meter.
Mass	Quantity of matter in an object.
Maximum	Highest or greatest amount or value.
Mean	Average of a number of different amounts.
Median	The middle number or the mean of the two middle numbers in a data set arranged in order.
Meter	Metric unit for measuring length, equal to 100 centimeters.
Metric System	Decimal system of measurement, uses multiples of ten.
Minimum	Lowest or least amount or value.
Mixed Number	A number written as a whole with a fraction.
mpg	Miles per gallon.
mph	Miles per hour.