unison(music: the simultaneous playing of an identical note more than once) noun [UK: ˈjuː.nɪs.n̩] [US: ˈjuː.nəs.n̩]John and Mary sang in unison. = John e Mary cantavano all'unisono.
all'unisonopreposition
in unison(moving or acting at the same time) preposition [UK: ɪn ˈjuː.nɪs.n̩] [US: ɪn ˈjuː.nəs.n̩]