Dictionary.com
Thesaurus.com
Synonyms

leviathan

American  
[li-vahy-uh-thuhn] / lɪˈvaɪ ə θən /

noun

  1. Bible. Often Leviathan a sea monster.

  2. any huge marine animal, as the whale.

  3. anything of immense size and power, as a huge, oceangoing ship.

  4. Leviathan, a philosophical work (1651) by Thomas Hobbes dealing with the political organization of society.


leviathan British  
/ lɪˈvaɪəθən /

noun

  1. Bible a monstrous beast, esp a sea monster

  2. any huge or powerful thing

"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

Leviathan Cultural  
  1. A sea monster mentioned in the Book of Job, where it is associated with the forces of chaos and evil.


Discover More

Figuratively, a “leviathan” is any enormous beast.

Leviathan is a work on politics by the seventeenth-century English author Thomas Hobbes.

Etymology

Origin of leviathan

First recorded in 1350–1400; Middle English levyathan, from Late Latin leviathan, ultimately from Hebrew liwyāthān

Explanation

A leviathan is a giant sea creature. It can be real, like a whale, or mythical. Moby Dick is an example of a famous leviathan. The word comes from Hebrew livyathan which means a great sea serpent or sea monster. A real leviathan is the giant sea squid Architeuthis, which was photographed alive for the first time in 2005. A leviathan can also be something that is really, really big. The Titanic was a leviathan that now rests with leviathans.

Keep Reading on Vocabulary.com

Vocabulary lists containing leviathan

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.

Once the leviathan of profit for companies like Johnson & Johnson and Boston Scientific, pelvic mesh was now the white whale of liability for mass tort plaintiffs’ attorneys.

From Slate • Jan. 13, 2026

It expanded into a $1.8 trillion leviathan through a series of big-ticket mergers.

From The Wall Street Journal • Dec. 6, 2025

A stiff primary challenge from the liberal leviathan, Massachusetts Sen. Edward M. Kennedy.

From Los Angeles Times • Dec. 29, 2024

What an extraordinary signing the Japanese leviathan has been, what a goals haul, what joy he has sparked among the Celtic support.

From BBC • Apr. 8, 2023

It had moved in the midnight waters of space like a pale sea leviathan; it had passed the ancient moon and thrown itself onward into one nothingness following another.

From "The Martian Chronicles" by Ray Bradbury