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:
Remember that dual has an a like in parallel, because it often means having two parts or functions working together.
Think of duel as being related to battle, a conflict between two parties, which is often what a duel is.
The word dual is used to describe things that come in pairs, while duel involves combat or competition, both of which have sounds in common with these descriptions.