` ::I'm going to broadly agree with B2c and Nick. And, to my personal dismay, I'm going to get into this particular WP:BIKESHED: what is the definition of definition? (Aaagh!) ``Definition`` (and no, I did not look this up in any dictionary) can refer to how a dictionary defines the specific meaning of a word, and it can also refer to how scholars of a concept categorize that concept. In fact, Jim is correctly applying the word ``define`` in that second (scholarly) sense, but what some of us are reacting to is that most readers, on seeing the word in the opening sentence of the page, will naturally construe it to be used in the first (dictionary) meaning. So it ends up that the proper application of NAD to this discussion is that, while it is a good thing to introduce the reader to the three ``definitions`` (however we end up doing it), most of us want to avoid making the lead read as though it were a dictionary definition. (I have no position as to what the meaning of ``is`` is.)   `