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Micro (Greek letter μ, mu, non- italic) is a unit prefix in the metric system denoting a factor of one millionth (10 −6). [1] It comes from the Greek word μικρός (mikrós), meaning "small".

The meaning of MICRO is very small; especially : microscopic.

Dec 11, 2025 · From New Latin micro- (“small”), from Ancient Greek μικρός (mikrós, “small”).

Add to word list very small: a microbrewery (Definition of micro from the Cambridge Academic Content Dictionary © Cambridge University Press)

Micro- is a combining form used like a prefix meaning “small.” In units of measurement, micro- means "one millionth." The form micro- is often used in a variety of scientific and technical …

Micro is a SI unit prefix in the metric system denoting a factor of 10⁻⁶ (one millionth). It is represented by the prefix micro or the symbol µ.

Aug 11, 2014 · “Micro is the smallest prefix.” Many assume micro- (μ, 10⁻⁶) is the smallest prefix because it’s commonly used in medicine and biology (e.g., micrometers, micrograms).

Illustrated definition of Micro-: A prefix meaning one-millionth (1/1,000,000 or 10-6) Examples: a micrometer is one-millionth...

Jun 25, 2025 · Meaning of micro, a metric system prefix denoting one-millionth. Discover smaller or larger SI units, micro-related tech terms, and more in this article.