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• siemens
  siemens

  noun

  the standard unit of electrical conductance in the International System of Units (SI), equal to the reciprocal of the ohm and replacing the equivalent MKS unit mho, orreciprocal ohm. S
• Siemens
  Siemens

  noun

  (Ernst) Werner von 1816–92, German inventor and electrical engineer.

siemens

¹ American  

[see-muhnz] / ˈsi mənz /

noun

(used with a singular verb)

1. Electricity. the standard unit of electrical conductance in the International System of Units (SI), equal to the reciprocal of the ohm and replacing the equivalent MKS unit mho, orreciprocal ohm. S

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Siemens ² American  

[see-muhnz, zee-muhns] / ˈsi mənz, ˈzi məns /

noun

1. (Ernst) Werner von 1816–92, German inventor and electrical engineer.

2. his brother Sir William Karl Wilhelm Siemens, 1823–83, English inventor, born in Germany.

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siemens ¹ British  

/ ˈsiːmənz /

noun

1. Formerly called: mho.   S.  the derived SI unit of electrical conductance equal to 1 reciprocal ohm

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Siemens ² British  

/ ˈsiːmənz /

noun

1. Ernst Werner von (ɛrnst ˈvɛrnər fɔn). 1816–92, German engineer, inventor, and pioneer in telegraphy. Among his inventions are the self-excited dynamo and an electrolytic refining process

2. his brother, Sir William, original name Karl Wilhelm Siemens. 1823–83, British engineer, born in Germany, who invented the open-hearth process for making steel

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siemens Scientific  

/ sē′mənz /

siemens plural

1. See mho

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Etymology

Origin of siemens

First recorded in 1930–35; named after Sir W. Siemens

Example Sentences

See Examples For:

Siemens

These companies supply aircraft manufacturers such as Boeing and Airbus, aircraft-engine makers including GE Aerospace, Rolls-Royce and RTX’s Pratt & Whitney and the power-turbine manufacturers GE Vernova, Siemens, Mitsubishi Heavy Industries and Caterpillar.

From The Wall Street Journal ● Jul. 10, 2026

Germany’s industrial heavy DAX gained 0.9%, led by Siemens Energy as the gas turbine-maker rose 4.6%.

From The Wall Street Journal ● Jun. 30, 2026

The German DAX fell 1.25% as industrials faltered, with Siemens and Rheinmetall down 2.2% and 1.9%, respectively.

From The Wall Street Journal ● Jun. 8, 2026

Nvidia’s new Vera CPU, requiring liquid cooling, and a partnership with nVent and Siemens for AI data centers are boosting related stocks.

From Barron's ● Jun. 2, 2026

In 1924, Hermann Werner Siemens, the German eugenicist and Nazi sympathizer, proposed a twin study that advanced Galton’s proposal by meticulously separating identical twins from fraternal twins.*

From "The Gene" by Siddhartha Mukherjee