Fendo

Fendo is the temperament which tempers out 40/39 in the 2.3.13/5 subgroup. This equates 4/3 with the tendo third 13/10. Fendo can be viewed as an alternative interpretation of scales, chords, etc. commonly associated with father, as it is sometimes perceived that father's characteristics tend to suggest harmonic function more than to actually serve as a temperament. It was named by Vector in 2025 as a contraction of fourth and tendo third.

In fendo, the fourth / tendo third serves the role of both, making the main chords of triadic harmony in fendo essentially suspended chords.

5edo and 13edo make good fendo tunings.