Concert Pitch
. The degree of sharpness or flatness adopted by a number of musicians acting in concert, that all the instruments may be in accord. Generally, a particular note is selected for the standard, as A or C, this note is put into the proper pitch, and all other notes are regulated by it.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.