Coincidance is when two things happen at the same time or in the same way, but it's just a coincidence or chance. It's like when you and your friend wear the same color shirt to school, but you didn't plan it. It just happened by accident. Or when you think of a song and it comes on the radio right after you thought about it. It's not magic, it's just coincidence. Sometimes coincidences can seem really cool or surprising, but they happen to everyone all the time!