coherency

• HYPHEN: co=her=en=cy

CIDE DICTIONARY

coherency, n. [L. cohaerentia: cf. F. cohérence.].

•  A sticking or cleaving together; union of parts of the same body; cohesion.  [1913 Webster]
•  Connection or dependence, proceeding from the subordination of the parts of a thing to one principle or purpose, as in the parts of a discourse, or of a system of philosophy; a logical and orderly and consistent relation of parts; consecutiveness.  [1913 Webster]

  "Coherence of discourse, and a direct tendency of all the parts of it to the argument in hand, are most eminently to be found in him."  [1913 Webster]
•  the state of cohering.  [WordNet 1.5]