:Isochronicity:

Pronunciation GB: ˌaɪsɒkrəˈnɪsəti, GA: ˌaɪsɑkrəˈnɪsət̬i
Adjective: GB: aɪˈsɒkrənəs, GA: aɪˈsɑkrənəs

The tendency for linguistic forms, especially syllables or feet, to have approximately the same duration as other similar forms in their environment.