Concession has multiple meanings depending on how it is used.
Concession is a type of imperialism in which private businesses invest in colonial territories in order to receive mineral rights (e.g., right to mine for gold) and land.
Concession is accepting a point of view in an argument. From the verb concede.
Concession is a lease on a part of a property for a specific use. A Concession Stand at a fair for example.