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• mu
  mu

  noun

  the 12th letter of the Greek alphabet (M, μ).
• Mu
  Mu

  noun

  another name for Lemuria.
• MU
  MU

  abbreviation

  Musicians' Union

mu

¹ American  

[myoo, moo] / myu, mu /

noun

1. the 12th letter of the Greek alphabet (M, μ).

2. the consonant sound represented by this letter.

3. micron.

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Mu ² American  

[myoo, moo] / myu, mu /

noun

1. another name for Lemuria.

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MU ¹ British  

abbreviation

1. Musicians' Union

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mu ² British  

/ mjuː /

noun

1. the 12th letter in the Greek alphabet (Μ, μ), a consonant, transliterated as m

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mu ³ British  

abbreviation

1. Mauritius

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Etymology

Origin of mu

First recorded in 1895–1900, mu is from the Greek word mŷ

Example Sentences

Micron MU, with a $665 billion market capitalization, has seen its stature grow rapidly as memory chips have proved a major bottleneck to the artificial-intelligence buildout.

From MarketWatch • May 4, 2026

Samsung’s chief memory rivals—SK Hynix of South Korea and U.S.-based Micron Technology MU 0.96%increase; green up pointing triangle —recently delivered similarly dizzying results.

From The Wall Street Journal • Apr. 30, 2026

Micron Technology’s MU 0.01%increase; green up pointing triangle second-quarter revenue nearly tripled as AI-related demand for memory is outpacing supply.

From The Wall Street Journal • Mar. 18, 2026

JtBodel: Sat here watching with my husband who has been a MU fan since his first match in 1976 and finding it hard to believe that he is cheering for the old enemy, Liverpool.

From BBC • Mar. 9, 2024

Such men as those called KA-DUR, KAPAR, MU, PATESI, are named on the letters as exempt from the service.

From Babylonian and Assyrian Laws, Contracts and Letters by Johns, C. H. W. (Claude Hermann Walter)