A monumental arch that commemorates a victory.(noun)
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Use "triumphal arch" in a sentence
"On the right-hand side was a triumphal arch in three-quarters view, with two quadrigas on top."
"I did hope I was going to vindicate him and have him played home by the village band under a triumphal arch with ‘Welcome, Champion of Truth!’ picked out in red-white-and-blue electric bulbs."
"Five centuries later they're in Rome, on top of a triumphal arch of Nero in the Forum, part of a sculptural group showing the emperor drawing a four-horse quadriga."