There are multiple definitions - click on the translation that matches your context.

concedente

full

grantor

noun

Comparative law notes

Spain

in the context of derecho de superficie; efiteusis, etc.

Definitions of grantor

English

a person who transfers a property right or other benefit to a recipient (grantee); a person who creates a trust by placing real or personal property in trust to a trustee on behalf of a beneficiary

If the grantor dies, all the trust property will likely be included in the grantor's estate for estate tax purposes.