con·​tra·​octave | \ ¦kän‧trə+\
plural contraoctaves

Definition of contraoctave

: the musical octave beginning with and ascending from the third C below middle C — see pitch illustration

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First Known Use of contraoctave

circa 1902, in the meaning defined above

History and Etymology for contraoctave

contra- + octave

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The first known use of contraoctave was circa 1902

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