1.  digression(n = noun.communication) aside, divagation, excursus, parenthesis - a message that departs from the main subject;
is a kind of content, message, subject matter, substance
Derived form verb digress₁

2.  digression(n = noun.act) deflection, deflexion, deviation, divagation, diversion - 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"
is a kind of turn, turning
has particulars: red herring
Derived form verb digress₁

3.  digression(n = noun.act) excursion - wandering from the main path of a journey;
is a kind of journey, journeying
Derived form verb digress₂

N  circuit, roundabout way, digression, detour, circumbendibus, ambages, loop, winding, zigzag, circuitous, indirect, roundabout, zigzag, backhanded, by a side wind, by an indirect course, in a roundabout way, from pillar to post.

N  deviation, swerving, obliquation, warp, refraction, flection, flexion, sweep, deflection, deflexure, declination, diversion, digression, depart from, aberration, divergence, zigzag, detour, divagation, wandering, vagrancy, evagation, bypaths and crooked ways, byroad, sidling, knight's move at chess, deviating, aberrant, errant, excursive, discursive, devious, desultory, loose, rambling, stray, erratic, vagrant, undirected, circuitous, indirect, zigzag, crab-like, astray from, round about, wide of the mark, to the right about, all manner of ways, circuitously, obliquely, sideling, like the move of the knight on a chessboard.