1. a shipping route or lane used by ships at sea
Usage: nautical
2. a canal or waterway that connects bodies of water and allows ships to pass through
3. the motion or movement of waves at sea
Usage: nautical

Examples

• The St. Lawrence Seaway connects the Great Lakes to the Atlantic Ocean.
• Heavy traffic in the seaway caused delays for cargo ships.
• The captain chose a different seaway to avoid the storm.
• Construction of the seaway took several years to complete.
• Ships must follow designated seaways to ensure safe passage.
• The rough seaway made navigation challenging for smaller vessels.