ground zero

noun

1

: the point directly above, below, or at which a nuclear explosion occurs

2

: the center or origin of rapid, intense, or violent activity or change

broadly : center sense 2a

the party town that served as ground zero for those corporate … bashes

—Rich Eisen

3

: the very beginning : square one

Synonyms

• axis
• base
• capital
• center
• central
• core
• cynosure
• epicenter
• eye
• focus
• heart
• hub
• locus
• mecca
• navel
• nerve center
• nexus
• nucleus
• omphalos
• seat

Examples of ground zero in a Sentence

ground zero in the battle over immigration laws

a city that was once ground zero for the insurance industry

Recent Examples on the Web

Each summer, the Milwaukee insurance and financial services company brings more than 12,000 employees and agents together for a week of meetings and events; ground zero is usually the Baird Center and Fiserv Forum, but they can be seen all over downtown. —Journal Sentinel, 23 May 2024

Detroit Free Press Michigan has become ground zero for the highly pathogenic H5N1 avian influenza virus that's sweeping the nation, killing turkeys, chickens and wild birds, infecting cows and other mammals — and now has sickened a third U.S. farmworker. —Kristen Jordan Shamus, Detroit Free Press, 26 Apr. 2024

For glorious Brazilian beaches, Copacabana is ground zero. —Cnt Editors, Condé Nast Traveler, 13 Dec. 2023

Consider again Hickory, North Carolina, which anchors a region of 380,000 people and was ground zero for the China trade shock. —Gordon H. Hanson, Foreign Affairs, 8 Nov. 2021

Word History

First Known Use

1946, in the meaning defined at sense 1

Kids Definition

ground zero

noun

1

: the site of a nuclear explosion

2

: the center of rapid, intense, or violent activity or change

3

: the very beginning : square one