I'm don't have time to look into it right now, but a few years ago I made an Olympic themed trivia, and I remember reading on the Olympic site that they considered "teams" to be groups of 3 or more individuals who play directly against another group of 3 or more individuals head-to-head. Thus, sports like canoe/kayak or even team synchro (even though it's in the name) were not considered "team sports" by the IOC. Oddly, by this definition beach volleyball would also not be considered a team sport.