Digression

Webster's Dictionary of the English Language

·noun A turning aside from the right path; transgression; offense.

II. Digression ·noun The elongation, or angular distance from the sun;

— said chiefly of the inferior planets.

III. Digression ·noun The act of digressing or deviating, ·esp. from the main subject of a discourse; hence, a part of a discourse deviating from its main design or subject.