cataclysm

noun

cat·​a·​clysm ˈka-tə-ˌkli-zəm 

1

: flood, deluge

2

: catastrophe sense 3a

3

: a momentous and violent event marked by overwhelming upheaval and demolition

broadly : an event that brings great changes

an international economic cataclysm

cataclysmal

ˌka-tə-ˈkliz-məl 

adjective

or cataclysmic

ˌka-tə-ˈkliz-mik 

cataclysmically

ˌka-tə-ˈkliz-mi-k(ə-)lē 

adverb

Synonyms

• alluvion
• bath
• cataract
• deluge
• flood
• flood tide
• inundation
• Niagara
• overflow
• spate
• torrent

Examples of cataclysm in a Sentence

floods, earthquakes, and other cataclysms

The country barely survived the cataclysm of war.

The revolution could result in worldwide cataclysm.

Recent Examples on the Web

The film begins, as usual, with a vision of cataclysm: a Space Needle–esque building that both collapses and explodes. —David Sims, The Atlantic, 22 May 2025

Produced and directed by Peter Yost and Michael Rohatyn, the film is about the financial cataclysm that hit New York City in 1975, when the powers that be figured out that the city was $6 billion in debt. —Owen Gleiberman, Variety, 21 Apr. 2025

In the real world, though, the cataclysm can come in on little cat feet. —Andrew Marantz, New Yorker, 28 Apr. 2025

The effect can't be explained by lava temperatures alone, but rather a different event from the cataclysm. —Michael Franco, New Atlas, 28 Feb. 2025

Word History

Etymology

French cataclysme, from Latin cataclysmos, from Greek kataklysmos, from kataklyzein to inundate, from kata- + klyzein to wash — more at clyster

First Known Use

1599, in the meaning defined at sense 1

Rhymes for cataclysm

• alyssum
• aneurysm

Kids Definition

cataclysm

noun

cat·​a·​clysm ˈkat-ə-ˌkliz-əm 

1

: a great flood

2

: a violent and destructive natural event (as an earthquake)

3

: a violent social or political change

cataclysmal

ˌkat-ə-ˈkliz-məl 

adjective

or cataclysmic

-mik