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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

A potato tycoon who couldn’t type was the first to bet big on Micron MU 19.29%increase; green up pointing triangle .

From The Wall Street Journal • May 26, 2026

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

Micron MU -3.01%decrease; red down pointing triangle Technology expects growth to soar higher in the coming months as AI developers scramble for a tight supply of memory-storage products.

From The Wall Street Journal • Dec. 17, 2025

Its campaign, which included sustained industrial action from September to March has achieved both goals, the MU said in a statement.

From BBC • Apr. 22, 2025

The only previous occurrence of this name is in Smith's Miscellaneous Texts, 11, 1 which has RI not MU.

From Sumerian Liturgies and Psalms by Langdon, Stephen