1. a structure built to carry water across land, especially a bridge-like structure that carries water over a valley or river
2. any artificial channel or pipe for conveying water

Examples

• The ancient Roman aqueduct still carries water to the city today.
• Engineers designed a modern aqueduct to transport water from the mountains.
• The stone aqueduct spans the entire valley.
• Water flows through the underground aqueduct system.
• The aqueduct was built in the 18th century to supply the growing town.
• Tourists come to see the impressive arches of the old aqueduct.