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year zero

British  

noun

  1. the beginning (1975) of the period during which Cambodia was under the control of the Khmer Rouge

  2. the beginning of revolutionary change

  3. the beginning of any new system or regime

"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

Etymology

Origin of year zero

C20: by analogy with Year One of the French Revolutionary calendar

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.

The number of new, half-hour shows from the BBC so far this year: zero.

From BBC • Sep. 10, 2025

Since the end of that 2009 season when the future looked so bright, there had been five losing seasons and, until this year, zero conference titles.

From Washington Times • Dec. 28, 2023

If you’re looking for your NBA feel-good story of the year, zero in on a former Washington State Cougar with a stroke pretty enough for an art expo.

From Seattle Times • Jun. 4, 2022

This was the modern superhero year zero, thanks to the success of the Robert Downey Jr-powered Iron Man and Christopher Nolan’s broody Bat-sequel The Dark Knight.

From The Guardian • Aug. 8, 2020

The lack of a year zero began to cause problems two centuries later.

From "Zero: The Biography of a Dangerous Idea" by Charles Seife