Dicklyon some of the notes you deleted contained correct and widely known information about which we all agree For instance the terms chromatic semitone and diatonic semitone are widely used Moreover as I wrote above we all agree that Tritone is used to indicate both A4 and d5 The article Tritone explains that in detail and the topic has already been discussed Are you going to delete the article as well By the way if you accept the definition of Whole tone given by Grove online see above then you also need to accept the obvious consequence that a d5 can be decomposed into three tones one of which is a d3 and hence can be called Tritone