What is the meaning of Reservoir?

A place where anything is kept in store.

A large natural or artificial lake used as a source of water supply.

A small intercellular space, often containing resin, essential oil, or some other secreted matter.

A supply or source of something.

A species that acts as host to a zoonosis when it is not causing acute illness in other susceptible species.

A "black box" component that receives an input signal to be read out and mapped by another process, as part of reservoir computing.

To store or keep (something) in or as in a reservoir.

reservoir

reservoir

Source: wiktionary.org