(n.) A separate incident or story in a literary work or series\, introduced for the purpose of giving a greater variety to the events related; an incidental narrative, or digression, separable from the main subject, but naturally arising from it.

action adventure affair anagnorisis angle architectonics architecture argument aside atmosphere background broken thread brokenness bypath byway catastrophe chapter characterization circumstance color complication continuity contrivance denouement departure design development deviation device digression disconnectedness disconnection discontinuance discontinuation discontinuity discontinuousness discreteness discursion disjunction event excursion excursus experience fable fact falling action fitfulness gimmick go hap happening happenstance incident incoherence incompleteness infix injection insert insertion insinuation intercalation interjection interlineation interlocution intermittence interpolation introduction irregularity line local color matter matter of fact mood motif movement mythos non sequitur noncontinuance nonlinearity nonseriality nonuniformity obiter dictum occasion occurrence parenthesis part particular peripeteia phenomenon plan plot reality recognition remark rising action scene scheme secondary plot side path side remark slant story structure subject subplot switch thematic development theme thing tone topic tossing-in turn of events twist