con·cert 
/ˈkɑ:nsɚt/ noun
plural con·certs /ˈkɑ:nsɚt/ noun [count] : a public performance of music
▪ a rock concert ▪ a classical concert ▪ The orchestra will be giving/having/holding a free concert. — sometimes used before another noun ▪ a live concert performance ▪ a concert pianist ▪ a concert hall
▪ a rock concert ▪ a classical concert ▪ The orchestra will be giving/having/holding a free concert. — sometimes used before another noun ▪ a live concert performance ▪ a concert pianist ▪ a concert hall
in concert 1 formal : together
▪ The FBI and the local police acted in concert to solve the murder. — often + with ▪ The FBI acted in concert with the local police to solve the murder. 2 : performing at a concert
▪ I went to hear them in concert. [=in a public performance]
▪ The FBI and the local police acted in concert to solve the murder. — often + with ▪ The FBI acted in concert with the local police to solve the murder.
▪ I went to hear them in concert. [=in a public performance]
