Circulation may refer to:

  • Circulatory system, a biological organ system whose primary function is to move substances to and from cells
  • Circulation (fluid dynamics), the path integral of the fluid velocity around a closed curve
  • Circulation (journal), one of the journals published by American Heart Association
  • Circulation (architecture), the flow of people through a building
  • Exhaust gas recirculation, a nitrogen oxide reduction technique used in most gasoline and diesel engines
  • Atmospheric circulation, the large-scale movement of air
  • Newspaper circulation, the average number of copies of a newspaper distributed on a day
  • Magazine circulation, the average number of copies of a periodical distributed per edition/ volume
  • Circulation (UK duo), a UK house music duo
  • Circulation problem, a generalization of network flow problems
  • Library circulation, the activities around the lending of library books and other material to users of a lending library
  • Circulation (currency), all currency held by consumers and businesses, but not by financial institutions and governments
  • Circulation Festival, an annual circus and fire performance festival held in Dunedin, New Zealand

Famous quotes containing the word circulation:

    The denunciation of the young is a necessary part of the hygiene of older people, and greatly assists the circulation of their blood.
    Logan Pearsall Smith (1865–1946)

    There is probably not more than one hundred dollars in cash in circulation today. That is, if you were to call in all the bills and silver and gold in the country at noon tomorrow and pile them on the table, you would find that you had just about one hundred dollars, with perhaps several Canadian pennies and a few peppermint Life Savers.
    Robert Benchley (1889–1945)

    We did not heed the sentries at the gate, nor did they us, and what under the sun they were placed there for, unless to hinder a free circulation of the air, was not apparent.
    Henry David Thoreau (1817–1862)