sidebar Syllabification: (side·bar)Pronunciation: /ˈsīdˌbär/Definition of sidebar noun chiefly North American a short article in a newspaper or magazine, typically boxed, placed alongside a main article, and containing additional or explanatory material. a secondary, additional, or incidental thing; a side issue. (also sidebar conference) (in a court of law) a discussion between the lawyers and the judge held out of earshot of the jury. sidebar in other Oxford dictionaries Definition of sidebar in the British & World English dictionary