Just a small one that has me stumped. In a newspaper article where I live in New Zealand there is a picture of guy riding a cyclocross bike with a caption saying that he is mountain biking. I realised I don't know the verb for riding a CX bike, is it simply called cycling or mountain biking?
Use the terminology you like. If enough people agree and use the same terminology, then that will become the correct way to speak about it. When Shakespear needed words to express new ideas, he invented or re-interperted terms from other languages, creating neologisms as needed.
I've heard people say Cross Riding, Cross Racing, Cyclocrossing, Crossing, Riding Cross, Racing Cross, Cross Biking.