1.335 whole tone ================ ES: tono (entero), I: tono intero, F: ton entier, D: Ganzton, NL: hele toon, DK: heltone, S: helton, FI: kokoaskel. The interval of a major second. The interval between two tones on the piano keyboard with exactly one key between them â including black and white keys â is a whole tone. See also ........ interval.