sea

noun

\ ˈsē

Definition of sea

1a : a great body of salt water that covers much of the earth broadly : the waters of the earth as distinguished from the land and air

b : a body of salt water of second rank more or less landlocked the Mediterranean sea

c : ocean

d : an inland body of water —used especially for names of such bodies the Caspian Sea

2a : surface motion on a large body of water or its direction also : a large swell or wave —often used in plural heavy seas

b : the disturbance of the ocean or other body of water due to the wind

3 : something likened to the sea especially in vastness a sea of faces

4 : the seafaring life

5 : mare entry 2

at sea

1 : on the sea specifically : on a sea voyage

2 : lost, bewildered

to sea

: to or on the open waters of the sea