junction
US /ˈdʒʌŋk.ʃən/
UK /ˈdʒʌŋk.ʃən/

1.
a point where two or more things are joined
:
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The accident happened at the junction of two main roads.
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This is a critical junction in the railway network.
2.
the action or fact of joining or being joined
:
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The junction of the two rivers creates a wider channel.
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The smooth junction of the new and old parts of the building was impressive.