sub·octave | \"+\
plural suboctaves

Definition of suboctave 

1a : the note an octave below a specified note often used before another noun

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First Known Use of suboctave

1659, in the meaning defined at sense 1a

History and Etymology for suboctave

sub- + octave

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The first known use of suboctave was in 1659

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a state of commotion or excitement

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