Definitions
1.NounA vast sea monster of tremendous strength, either imaginary or real, described as the most dangerous and powerful creature in the ocean.
2.NounA thing which is monstrously great in size, strength, etc. (especially a ship); also, a person with great power or wealth.
3.NounA thing which is monstrously great in size, strength, etc. (especially a ship); also, a person with great power or wealth.
4.NounSometimes in the form Leviathan: based on the writings of Thomas Hobbes, the political state, especially a domineering and totalitarian one.
5.NounSynonym of Satan (“the supreme evil spirit in the Abrahamic religions, who tempts humanity into sin; the Devil”).
6.AdjectiveVery large; enormous, gargantuan.