[ lɪ'vʌɪəθ(ə)n ]
■ noun
1》 (in biblical use) a sea monster.
↘a very large aquatic creature, especially a whale.
↘a very large or powerful thing.
2》 an autocratic monarch or state. [with allusion to Hobbes' Leviathan (1651).]
Origin
via late L. from Heb. liwyāṯān .