in unison

1. In complete agreement, harmonizing exactly. For example, Their opinion was in unison with ours . [Early 1800s]

2. Saying the same thing at the same time, simultaneously, as in The whole class answered in unison . [Late 1800s] Both usages allude to the unison of music, a single identical pitch.

Related Words

• accordingly 
• collectively 
• cooperatively www.thesaurus.com
• in tandem www.thesaurus.com
• mutually 
• simultaneously 
• together 
• unitedly www.thesaurus.com