noun (n)

• a variable quantity that can be resolved into components(noun.cognition)

  source: wordnet30
• a straight line segment whose length is magnitude and whose orientation in space is direction(noun.shape)

  source: wordnet30
• any agent (person or animal or microorganism) that carries and transmits a disease(noun.object)

  Example:
  Mosquitos are vectors of malaria and yellow fever.
  Fleas are vectors of the plague.
  When medical scientists talk about vectors they are usually talking about insects.
  

  Synonym:
  transmitter
  

  source: wordnet30
• (genetics) a virus or other agent that is used to deliver DNA to a cell(noun.animal)

  source: wordnet30
• Same as Radius vector.(noun)

  source: webster1913