A departure from the subject, course, or ideaat hand; an exploration of a different or unrelated concern. (noun)
Examples of word digression
Many novels contain what I call the digression-into-theme.
Finally, in what can only be described as a digression from a digression, I feel compelled to mention that there is a multi-purpose, high quality item, within reach theoretically, that I cannot bring myself to buy, though I am convinced of its usefulness and value.
But all this is what they call a digression; it has nothing to do with the dragon's teeth I am now narrating.
(Notice how I used "arguably" to avoid digression from the immediate topic - not to avoid actually making a point.) "Now that I've partly diminished my own enjoyment of this by having to explain the humour ..."
Particularly by that wee digression from the source text (the whole mother not dying thing).
The reason for this historic digression is that Jordan has made an interesting discovery.
Warning: all this post is a digression from the topic!
And feel free to move this post to the "Open Thread", as it is quite a digression from the original topic.