From Longman Business Dictionaryadditionalityad‧di‧tion‧al‧i‧ty /əˌdɪʃəˈnæləti/ noun [uncountable] British English ECONOMICS a rule or principle stating that the money spent by a government on public services such as health and education can be added to from other funds, especially European Union GRANTs, but cannot be replaced by those grants altogetherSpain and Portugal have the same system of additionality as we have here in the UK.
