Longman Dictionary of Contemporary English homepage

coincidental

adjective
     
co‧in‧ci‧den‧tal
happening completely by chance without being planned [↪ coincidence]
purely/completely/entirely coincidental
Any similarity between this film and real events is purely coincidental.
coincidentally adverb [sentence adverb]
We have become profitable. Not coincidentally, we have only half as many employees as we did in 1988.

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