1. crossing or extending across the Atlantic Ocean
2. relating to countries on both sides of the Atlantic Ocean, especially Europe and North America

Examples

• The transatlantic flight from New York to London takes about seven hours.
• She booked a transatlantic cruise from Miami to Southampton.
• The transatlantic partnership between the US and Europe has strengthened over decades.
• Transatlantic trade agreements benefit both American and European businesses.
• The first transatlantic telegraph cable was laid in 1858.
• Many transatlantic travelers prefer direct flights to avoid layovers.