isochronism

\\īˈsäkrəˌnizəm; ˌīsəˈkrōˌn- also ˌīzəˈkrōˌn-\ noun (-s)

Etymology: French isochronisme, from Greek isochronos isochronous + French -isme -ism

1.

a. : the condition of property of having a uniform period of vibration — used of a pendulum or a watch balance

b. : uniformity of rate of operation — used of a timepiece

2.

a. : equal duration of units or measures in prosody

b. : emphasis on stable rhythmic units in poetry

3. [is- + chron- + -ism] : the condition of having identical chronaxies — used of excitable structures (as motor neurones and muscle fibers)