first principle
Americannoun
noun
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one of the fundamental assumptions on which a particular theory or procedure is thought to be based
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an axiom of a mathematical or scientific theory
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
As in medicine, the first principle of policymakers is “do no harm.”
From Barron's • Apr. 30, 2026
The first principle of politics is the opposite.
From The Wall Street Journal • Mar. 31, 2026
"The first principle in the academic world is that you direct your reader to your source material, and that isn't happening here," she said.
From BBC • Apr. 9, 2025
"Moving forward, we need to design and optimize materials with sustainability metrics as a first principle."
From Science Daily • Apr. 26, 2024
“Lay the stones level, that’s the first principle in keeping a wall from shifting and falling down. “The second is to lay the stones one on two, two on one.
From "On the Far Side of the Mountain" by Jean Craighead George
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
