day one
Americannoun
Etymology
Origin of day one
First recorded in 1975–80
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.
“We recognized on day one that command-and-control was going to be our secret sauce,” Guetlein said at a recent industry conference.
From The Wall Street Journal • Mar. 24, 2026
A huge component of “NCIS” that has remained consistent from day one is that it’s more than a case-of-the-week procedural.
From Los Angeles Times • Mar. 24, 2026
"We did not want this war. From day one, we have called for de-escalation," Denmark's Foreign Minister Lars Lokke Rasmussen told Danish media in Brussels before an EU foreign ministers' meeting.
From Barron's • Mar. 16, 2026
Wearing a red nose, Greg punched the air as he cycled away from the cheering crowd and headed off towards Bristol, the checkpoint for the end of day one.
From BBC • Mar. 13, 2026
“Each day, one more danger is eliminated,” Dr. Atkinson said.
From "Ugly" by Robert Hoge
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.
