decision - 1.(of the Speaker) A ruling on the procedural acceptability of some matter before the House, which, unless otherwise specified, serves as a precedent to govern future proceedings. Such rulings are final; they may not be debated or appealed. 2.(of a chairman) A ruling on the procedural acceptability of some matter before a committee which may serve as a precedent in future committee proceedings. The rulings may be appealed to the committee or, if delivered in Committee of the Whole, to the Speaker.