A more thorough explanation:

Definition: Concessor (kənˈsɛsər). Historically, a grantor. Compare with CONCESSUS.

Examples:

• The king was the concessor of land to his loyal subjects.
• The company acted as the concessor of the mining rights to the local community.

The examples illustrate how the term "concessor" refers to a person or entity that grants something to another party. In the first example, the king is the concessor who grants land to his loyal subjects. In the second example, the company is the concessor who grants mining rights to the local community.