digression

(noun) a message that departs from the main subject. Synonyms: aside, excursus, divagation, parenthesis.

(noun) a turning aside (of your course or attention or concern). Synonyms: diversion, deviation, deflection, deflexion, divagation. Examples: "A diversion from the main highway." "A digression into irrelevant details." "A deflection from his goal."

(noun) wandering from the main path of a journey. Synonyms: excursion.