Definition of additionality in English:

additionality

noun

  • The fact or concept of being additional; especially any principle or policy that involves pursuing economic or financial practice according to this concept; specifically (in the European Union) the requirement that central funding should supplement, and not replace, national expenditure on a project.

Origin

1950s; earliest use found in The American Economic Review. From additional + -ity.

Pronunciation:

additionality

/əˌdɪʃəˈnalɪti/