U.S. Republican presidential candidate Donald Trump (2nd from L) watches with his wife Melania as Serena Williams of the U.S. plays against her sister and compatriot Venus Williams in their quarterfinals match at the U.S. Open Championships tennis tournament in New York, September 8, 2015.
(plural aqueducts). 1  An artificial channel that is constructed to convey water from one location to another. 2  A structure carrying water over a river or depression, especially in regards to ancient aqueducts.
An arch is a curved structure that spans a space and may or may not support weight above it. Arch may be synonymous with vault, but a vault may be distinguished as a continuous arch forming a roof.