tank used for collecting and storing a liquid (as water or oil)
lake used to store water for community use
anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies; "an infectious agent depends on a reservoir for its survival"
a large or extra supply of something; "a reservoir of talent"
the entire range of skills or aptitudes or devices used in a particular field or occupation; "the repertory of the supposed feats of mesmerism"; "has a large repertory of dialects and characters"