concentĭo, ōnis, f. [concino],
a singing together, harmony (very rare): clarissima (catervae), Cic. Sest. 55, 118; id. Tim. 8, 24; App. de Mundo, p. 71, 20.
concentiō ōnis, f con- + 1 CAN-, a singing together, harmony : clarissima. ...
An Elementary Latin Dictionary