Source : Webster's Revised Unabridged Dictionary (1913)

Disjunct \Dis*junct"\, a. [L. disjunctus, p. p. of disjungere to
   disjoin. See {Disjoin}, and cf. {Disjoint}.]
   1. Disjoined; separated. [R.]

   2. (Zo["o]l.) Having the head, thorax, and abdomen separated
      by a deep constriction.

   {Disjunct tetrachords} (Mus.), tetrachords so disposed to
      each other that the gravest note of the upper is one note
      higher than the acutest note of the other.

Source : WordNet®

disjunct
     adj 1: progressing melodically by intervals larger than a major
            second [ant: {conjunct}]
     2: having deep constrictions separating head, thorax, and
        abdomen, as in insects
     3: marked by separation of or from usually contiguous elements;
        "little isolated worlds, as abruptly disjunct and
        unexpected as a palm-shaded well in the Sahara"-
        Scientific Monthly [syn: {isolated}]
     4: used of distributions, as of statistical or natural
        populations; "disjunct distribution of king crabs"