discursion

Discursion \Dis*cur"sion\, n. [LL. discursio a running different
   ways. See {Discourse}.]
   The act of discoursing or reasoning; range, as from thought
   to thought. --Coleridge.
   [1913 Webster]
    

84 Moby Thesaurus words for "discursion":
      Wanderjahr, aberrancy, aberration, afoot and lighthearted, aside,
      bend, bias, branching off, bumming, bypath, byway, circuitousness,
      corner, crook, curve, declination, departure, detour, deviance,
      deviancy, deviation, deviousness, digression, divagation,
      divarication, divergence, diversion, dogleg, double, drift,
      drifting, episode, errantry, excursion, excursus, exorbitation,
      flitting, gadding, hairpin, hoboism, indirection, itineracy,
      itinerancy, nomadism, obliquity, parenthesis, peregrination,
      pererration, ramble, rambling, roam, roaming, rove, roving, sheer,
      shift, shifting, shifting course, shifting path, side path,
      side road, sidetrack, skew, slant, straying, sweep, swerve,
      swerving, swinging, tack, traipsing, turn, turning, twist,
      vagabondage, vagabondia, vagabondism, vagrancy, variation, veer,
      wandering, wayfaring, yaw, zigzag