coincidence noun

ADJ. complete, pure, sheer It was pure coincidence that they were both in Paris on the same day. | mere | happy What a happy coincidence to meet you at the airport just when I wanted to see you. | unfortunate, unhappy | amazing, curious, extraordinary, funny, incredible, odd, remarkable, strange, wonderful

QUANT. series, set, string They met through a series of strange coincidences.

COINCIDENCE + VERB happen Remarkable coincidences do happen in real life.

PREP. by (a) ~ By coincidence, we both went to the same school. By an unfortunate coincidence, their house was burgled on the day he lost his job.