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micro-Symbol: μ. A prefix to a unit, indicating a fraction of 10–6 (i.e. one millionth) of that unit. For example, one micrometer is 10–6 meter.
A prefix representing 10-6, or one-millionth.
(science and technology)
A prefix indicating smallness, as in microwave.
A prefix indicating extreme sensitivity, as in microradiometer and microphone.