Definitions
1.NounAn aside, an act of straying from the main subject in speech or writing."The lectures included lengthy digressions on topics ranging from the professor's dog to the meaning of life."
2.NounThe act of straying from the main subject in speech or writing, particularly for rhetorical effect."make digression... by way of digression..."
3.NounA deviancy, a sin or error, an act of straying from the path of righteousness or a general rule.
4.NounA deviation, an act of straying from a path.
5.NounAn elongation, a deflection or deviation from a mean position or expected path.