What is the two different definitions of coicide?

There is no word "coicide." It's likely a misspelling of coincide, which means:

1. To happen at the same time: This definition is used to describe two or more events happening simultaneously. For example, "The start of the concert coincided with the arrival of the rain."

2. To be the same: This definition describes two or more things being identical or having the same characteristics. For example, "The opinions of the two scientists coincided on the subject of climate change."

If you were looking for a different word entirely, please provide more context or the full sentence where you encountered this word.