53 equal temperament
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In music, 53 equal temperament, called 53 TET, 53 EDO, or 53 ET, is the tempered scale derived by dividing the octave into 53 equal steps. Each step represents a frequency ratio of 21⁄53, or 22.6415 cents, an interval sometimes called the Holdrian comma.
Figure 1: 53-TET on the syntonic temperament's tuning continuum at 701.89, from (Milne et al. 2007)
Equal temperament
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An equal temperament is a musical temperament or tuning system that approximates just intervals by dividing an octave into steps such that the ratio of the frequencies of any adjacent pair of notes is the same. This system yields pitch steps perceived as equal in size, due to the logarithmic changes in pitch frequency.
Zhu Zaiyu's equal temperament pitch pipes
Figure 1: The regular diatonic tunings continuum, which include many notable "equal temperament" tunings.