Diffence means "minus" - i.e. "what is this thing minus this thing". Difference is called the difference because it involves finding out what is between two or more numbers - you can think of it as "what do I have to add to this number to reach that one".
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I do not know of such a word related to math(s)
There is no such math word, so it does not mean anything. You may wish to check your spelling before posting questions!