concessionality noun2 •The degree by which a loan or trade reduces the lender's or one trading partner's returns in comparison with what they would get at full market rates.The concessionality of tied aid credits is typically underwritten by development assistance (aid) agency budgets rather than export credit agency budgets. — 2004 •A mechanism by which a loan or trade agreement results in the lender or one party receiving less than full market value. formsconcessionalities