Definition of unisonance in English:
unisonance
Pronunciation /juːˈnɪsənəns/ /juːˈnɪs(ə)nəns/ /jʊˈnɪsənəns/
noun
Identity of pitch or sound; unison. Hence (in extended use): uniformity.
Origin
Mid 17th century. From post-classical Latin unisonantia from unisonus + -antia.