conjoint tetrachords

from The Collaborative International Dictionary of English v.0.48
Conjoint \Con*joint"\, a. [F. conjoint, p. p. of conjoindre. See
   {Conjoin}, and cf. {Conjunct}.]
   United; connected; associated. "Influence conjoint."
   --Glover.
   [1913 Webster]

   {Conjoint degrees} (Mus.), two notes which follow each other
      immediately in the order of the scale, as ut and re.
      --Johnson.

   {Conjoint tetrachords} (Mus.), two tetrachords or fourths,
      where the same note is the highest of one and the lowest
      of the other; -- also written {conjunct}.
      [1913 Webster]
    

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