In case of WordNet similarity measures like resnik, lin, leacock, etc what is meaning of path length?

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what exactly is path length and how to compute the same. I am using jaws

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WordNet is a graph, or, more precisely, a tree of hyponym/hypernym relations. A path in that tree is a sequence of edges and the length of a path is the number of edges in it. Note that the path between two nodes is comprised of the paths between either element and their lowest common ancestor node.