Usage Note
Coincidencia refers to two or more things happening at the same time or being identical by chance. ¡Qué coincidencia! is the natural exclamation for 'What a coincidence!' The verb is coincidir (coinciden en su opinión = they agree in their opinion). It can also mean agreement of views, not only accidental timing.
Examples
"Fue una pura coincidencia encontrarnos allí."
Natural Translation
It was a pure coincidence to meet there.
Literal Translation
It was a pure coincidence to-find-ourselves there.

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