- Noun. The property of being additional.
- Noun. (economics) Net positive difference that results from economic development intervention. The extent to which an activity (and associated outputs, outcomes and impacts) is larger in scale, at a higher quality, takes place quicker, takes place at a different location, or takes place at all as a result of intervention. Additionality measures the net result, taking account of deadweight, leakage, displacement, substitution and economic multipliers.''Scottish Enterprise (2007) Scottish Enterprise Economic Impact Assessment Guidance, Version 1.0, Scottish Enterprise: Glasgow.''.