1. A combining form or prefix meaning small, little, trivial, slight; as, microcosm, microscope. A millionth part of; as, microfarad, microohm, micrometer.

2. <physics> Metric prefix indicating 1/1,000,000th of a given quantity. For example, a microampere is 1/1,000,000th of an ampere.

Origin: Gr. mikros small.

(29 Oct 1998)

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