divagation

nouns

a message that departs from the main subject
aside, digression, divagation, excursus, parenthesis
is derived from
divagate
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"
deflection, deflexion, deviation, digression, divagation, diversion
is derived from
divagate