The term "tripartite" means something that contains three
parts.
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tri = three
lateral = sided
Trilateral = A three sided object or something agreed upon by
three parties
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Relationship between three countries or 3 sides is called as
tripartite relationship
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to have a three way call you have to call a party. Then, you
press flash, and call another party. After it rings, press flash
again and you will be in a three way call.