1. The continuous body of salt water covering most of the earth's surface, especially this body regarded as a geophysical entity distinct from earth and sky. 2. A tract of water within an ocean. 3. A relatively large body of salt water completely or partially enclosed by land. 4. A relatively large landlocked body of fresh water. 5. a high sea. 6. a sea of controversy. 7. Seafaring as a way of life. 8. A lunar mare. 9. sea air; sea voyages. 10. On the sea, especially on a sea voyage. 11. In a state of confusion or perplexity; at a loss.
