A diatonic interval of five notes. Its ratio is 2:3, the diapente of the ancients. [A Dictionary of Musical Terms]

The interval between the root and the fifth tone above it.

**Ramsay**

If it be asked why no more primes than 2, 3, and 5 are admitted into musical ratios, one reason is that consonances whose vibrations are in ratios whose terms involve 7, 11, 13, *etc.*, would be less simple and harmonious than those whose terms involve the lesser primes only. Another reason is this - as **perfect fifths** and other intervals resulting from the number 3 make the schism of a comma with perfect thirds and other intervals resulting from the number 5, so intervals resulting from the numbers 7, 11, 13, *etc.*, would make other schisms with both those kinds of intervals. [Scientific Basis and Build of Music, page 75]

See Also

**4plusplus**
**Fifth**
**Interval**
**Music**
**Perfect**
**Table 11.02 - Fifth is Double Tone**
**7.14 - Fifth**
**9.11 - Love or Sympathy is Perfect Continuity**
**11.13 - Dominant Conditions are Mated Opposing Pairs as Fifths**