day one

American  

noun

1. (often initial capital letters) the very first day or beginning of something.

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Etymology

Origin of day one

First recorded in 1975–80

Example Sentences

Iran's rulers appear intent on showing they will survive the war and maintain control, despite their supreme leader Ali Khamenei being killed on day one.

From Barron's

Spain will hold an auction on Thursday while France will hold two bond sales on the same day, one for short- and medium-term nominal bonds and the other for inflation-linked bonds.

From The Wall Street Journal

On Day One of a new postwar world, the rebuilding of a great city had already begun.

From The Wall Street Journal

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

The next day, one player who had remained in Australia changed her mind.

From The Wall Street Journal

Related Words

• birth
• creation
• dawn
• inauguration
• inception
• introduction
• onset
• opening
• outset
• starting point
• top