American Heritage Dictionary
(6)
Century Dictionary
(8)
GNU Webster's 1913
(2)
WordNet
(3)
Elsewhere on the web
Pumping their right fists in unison, they marched through Pyongyang's main Kim Il Sung plaza pledging their loyalty, some waving huge red flags as top officials watched from a viewing stand.— Daily Express News Feeds
Keezer's "Araña Amarilla" (a desert flower) begins with piano and alto sax (Steve Wilson) in unison, the harmonies suggesting two horns.
Beating in unison, the group may look and sound like any ensemble of attentive music students, but they're also working out.— Catholic Online > Daily Readings
That music makes people stand in a line and act all crazy in unison -- we can't have that!— Original Signal - Transmitting Digg
As fans sing "Burnin 'Up" in unison, the actual, living-and-breathing Jonas Brothers walk into the theater, grab a mic and begin thanking their fans for coming out.

American Heritage Dictionary (1)
Century Dictionary (1)
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