There is no such word as 'revelant'. If the word you are looking for is 'relevant', it means something related to a particular topic. For example: 'How many bananas a monkey eats isn't relevant to what we are learning right now', or, 'How many bananas a monkey eats isn't related to what we are learning right now'. The two words mean pretty much the same thing and are used in the same context.
I hope that helped, however if it was 'revelant' you were looking for, then I'm afraid I won't be able to help since it is a non-existant word.