She enjoyed a dual relationship with Maria.The phone has a dual SIM function.His dual nationality led to many benefits.
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Duel
/ˈdjuːəl/
A formal fight or competition between two people, often to settle a disagreement
Examples:
A duel at dawn settled their longstanding rivalry.Honour was to be defended by a duel on that fateful day.They faced each other in a duel, armed with swords and pride.
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Ways to tell them apart:
Dual relates to something double or consisting of two parts, like a dual carriageway with two lanes of traffic.
Duel is a historical term often associated with a formal combat between two people, typically to resolve a personal difference.
A simple way to remember is Dual contains an A which can be thought of as representing Addition, indicating two parts or kinds.
The word Duel has an E as in Enemy, hinting at combat or a contest between two adversaries.
Think of Dual like a pair of things working together, whereas Duel involves two people facing off against each other.