Of, relating to, or being a concession; concessionary(adjective)
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Use "concessional" in a sentence
"During the April 2008 India-Africa Forum Summit, India pledged $500 million in concessional credit facilities to eight resource rich West-African nations."
"External food aid now comes primarily from China and South Korea in the form of grants and long-term concessional loans."
"Will you go further than President Bush did in your aid package to Russia, such as including long-term concessional financing or government guarantees?"