fortuitous
US /fɔːrˈtuː.ə.t̬əs/
UK /fɔːrˈtuː.ə.t̬əs/
1.
happening by accident or chance rather than design
:
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The discovery of penicillin was a fortuitous event.
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It was a fortuitous coincidence that we met at the airport.
2.
happening by a lucky chance; fortunate
:
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It was fortuitous that the train was delayed, as I almost missed it.
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Their meeting was entirely fortuitous, but it led to a great partnership.