tank⋅age
   /ˈtæŋkɪdʒ/ [tang-kij]
ânoun
1. the capacity of a tank or tanks.
2. the act or process of storing liquid in a tank.
3. the fee charged for such storage.
4. the residue from tanks in which carcasses and other offal have been steamed and the fat has been rendered, used as a fertilizer.