COINCIDENCE

[noun] [C]A coincidence is an occasion when two or more things happen at the same time, esp. in a way that is unlikely and surprising.You've had your hair cut in the same style as me - what a coincidence!Is it a coincidence that the wife of the man who designed the competition won first prize?We came to be here by a series of strange coincidences.Coincidence also means chance or luck.Just by coincidence, I met my old school-mate fifty years later. [U]It was pure/sheer coincidence that I remembered his phone number. [U + that clause]