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A millionth of a meter is called a micrometer, often abbreviated as "micron".A millionth of a meter is called a micrometer, often abbreviated as "micron".A millionth of a meter is called a micrometer, often abbreviated as "micron".A millionth of a meter is called a micrometer, often abbreviated as "micron".
One millionth of a second is called a microsecond (as can be found at College and Graduate School of Arts and Sciences, Boston University http://www.cs.bu.edu/faculty/snyder/cs210/Units.htm). There is some conjecture that the correct answer to this question could also be a billisecond (in that in Imperial Measure milli means one thousandth and billi means one millionth).
nanometer
Microgram
One billionth of one millionth in the US is 1 x 10-15. In the UK it is 1 x 10-18.