noun (n)

• a large or extra supply of something(noun.quantity)

  Example:
  A reservoir of talent.
  

  source: wordnet30
• lake used to store water for community use(noun.artifact)

  Synonym:
  artificial lake, man-made lake
  

  source: wordnet30
• tank used for collecting and storing a liquid (as water or oil)(noun.artifact)

  source: wordnet30
• anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies(noun.object)

  Example:
  An infectious agent depends on a reservoir for its survival.
  

  Synonym:
  source
  

  source: wordnet30
• A place where anything is kept in store; especially, a place where water is collected and kept for use when wanted, as to supply a fountain, a canal, or a city by means of aqueducts, or to drive a mill wheel, or the like.(noun)

  source: webster1913