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fundamental unit

British  

noun

  1. one of a set of unrelated units that form the basis of a system of units. For example, the metre, kilogram, and second are fundamental units of the SI system

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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The billable hour as the fundamental unit of business for professional services is so widespread that it’s difficult to remember that it is a fairly recent innovation, becoming prevalent in the 1960s and 1970s.

From The Wall Street Journal Dec. 4, 2025

Mukherjee recounts the beginnings of cell theory among 19th-century European scientists and the growing consensus that the cell is the fundamental unit of life in plants and animals.

From Washington Post Oct. 24, 2022

All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms.

From Textbooks Jun. 9, 2022

It calls attention to the line as a fundamental unit, which in some sense always stands alone — the next line could always be anything.

From New York Times Jan. 25, 2022

Together, they realize that the cell is the fundamental unit of life.

From "Phineas Gage" by John Fleischman

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