Since the word vectors have non-negative components, the range is between 0 and 1, where a value of 0 indicates that the vectors are orthogonal or dissimilary and a value of 1 indicates that the vectors are parallel or similar.
in this work, we make a choice of defining the cooccurence relation as the joint cooccurence of the word within a short window of text, by the principle of occam's razor.