base unit

noun

plural base units
: one of a set of fundamental units in a system of measurement that is based on a natural phenomenon or established standard and from which other units may be derived
The base units of the International System of Units are the meter, kilogram, second, ampere, kelvin, mole, and candela.
compare absolute unit

Examples of base unit in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The price for the base unit without any storage is $399.99 / £379.99 / €429,99. Mark Sparrow, Forbes.com, 6 July 2025 Beyond weight capacity and safety, enthusiasts can customize their at-home gym experience with an array of accessories compatible with the base unit. Kaitlyn Gomez, USA Today, 1 May 2025 Bothwell plans to ask the PB Planning Group to send a letter requesting that the city investigate the base unit aspect of the Turquoise project. Noah Lyons, San Diego Union-Tribune, 24 Jan. 2025 OpenAI charges $15 per million tokens (the base unit of AI data, equivalent to about 1.5 words) of input and $60 per million output tokens, whereas a million input tokens cost Reasoner 8 cents, and a million output tokens just 30 cents. David Meyer, Fortune, 4 Dec. 2024 Its base unit is not the droning chord, but instead the articulated phrase—however serene, this is a music of statements, not mere soundscapes. Pitchfork, 3 Dec. 2024 There's also still no way to exit a game and return to the title selection screen short of physically hitting the reset button on the base unit. Matt Kamen, WIRED, 27 Sep. 2017 The base unit relays the signal to a monitoring agency, where a central computer is programmed to send an alert to agency personnel if a check-in signal is not received when the offender is supposed to be at home. Robert S. Gable, IEEE Spectrum, 20 July 2017

Word History

First Known Use

1867, in the meaning defined above

Time Traveler
The first known use of base unit was in 1867

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Cite this Entry

“Base unit.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/base%20unit. Accessed 9 Sep. 2025.

Medical Definition

base unit

noun
: one of a set of simple units in a system of measurement that is based on a natural phenomenon or established standard and from which other units may be derived see international system of units
Last Updated: - Updated example sentences
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