title: What is "least common subsumer" and how to compute it?
body: <p>I want to use Wu and Palmer method for computing similarity measure in wordnet,</p>
  
  <pre><code>wp = (2 X depth(lcs)) / (depth(synset1) + depth(synset2))
  </code></pre>
  
  <p>where <code>lcs</code> is the "least common subsumer" of <code>synset1</code> and <code>synset2</code></p>
  
  <p>My question is:</p>
  
  <ol>
  <li>What is "least common subsumer"?</li>
  <li>How to compute it?</li>
  </ol>