digression

[1]	aside , aside , excursus , departure , deviation , divagation , parenthesis , detour , obiter dictum , parenthesis , apostrophe , excursus
[2]	digressing , diversion , deviation , deviating , divergence , deflection , deflexion , going off at a tangent , rambling , divagation , meandering , straying , wandering , deviation
[3]	excursion