Source : Webster's Revised Unabridged Dictionary (1913)

Divagation \Di`va*ga"tion\, n. [L. divagari to wander about; di-
   = dis- + vagari to stroll about: cf. F. divagation. See
   {Vagary}.]
   A wandering about or going astray; digression.

         Let us be set down at Queen's Crawley without further
         divagation.                              --Thackeray.

Source : WordNet®

divagation
     n 1: a message that departs from the main subject [syn: {digression},
           {aside}, {excursus}, {parenthesis}]
     2: a turning aside (of your course or attention or concern); "a
        diversion from the main highway"; "a digression into
        irrelevant details"; "a deflection from his goal" [syn: {diversion},
         {deviation}, {digression}, {deflection}, {deflexion}]