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The name normally given to an interval of two semitones and more properly called a Whole Tone to distinguish it.

Thinking of a tone as a whole note is not quite accurate as in any scale or mode, there is a progression of whole tones and semitones. In the scale of C Major (Key of C) for example, C to D is two semitones, as is D to E but E to F is only one semitone.