aside - noun

a line spoken by an actor to the audience but not intended for others on the stage

a message that departs from the main subject

aside - adverb

• on or to one side
• out of the way (especially away from one's thoughts)
• not taken into account or excluded from consideration
• in a different direction
• placed or kept separate and distinct as for a purpose
• in reserve; not for immediate use

aside - thesaurus

apart   away   by   digression   divagation   excursus   parenthesis