digression
noun
[ dʌɪˈɡrɛʃ(ə)n ]
• a temporary departure from the main subject in speech or writing.
• "let's return to the main topic after that brief digression"
Similar:
deviation,
detour,
diversion,
departure,
excursus,
aside,
incidental remark,
footnote,
parenthesis,
deviation from the subject,
straying from the topic,
straying from the point,
going off at a tangent,
getting sidetracked,
losing one's thread,
divergence,
straying,
drifting,
rambling,
wandering,
meandering,
maundering,
obiter dictum,
excursion,
apostrophe,
divagation,