Amount that the promoted price drops below the regular price, expressed as a percentage. Calculated as (Base Price – Promoted Price)/Base Price. A higher number means a deeper discount. A deeper discount for the same tactic almost always results in a higher lift. % Discount is available by merchandising tactic on custom databases.
Reference article: Discount: The Often Overlooked Pricing Measure
Are these definitions (not just % Discount, but your overall glossary) the same in both ACN and IRI data sets?
Generally, Nielsen and IRI define their measures the same way. They may, however, use slightly different names for the same measure. We try to note both names if we are aware of differences.