free movement or passage (as of cytoplasm within a cell or sap through a plant); "ocean circulation is an important part of global climate"; "a fan aids air circulation"(特に、細胞の中の細胞質、または、植物の中を通る樹液のような)自由な動きまたは移動循環
例:ocean circulation is an important part of global climate 海洋循環は、世界的な気候の重要な部分である
number of copies of a newspaper or magazine that are sold; "by increasing its circulation the newspaper hoped to increase its advertising"販売される新聞か雑誌の本の部数流通
例:by increasing its circulation the newspaper hoped to increase its advertising 流通を増加させることによって、新聞は、広告を増加させることを望んでいた
movement through a circuit; especially the movement of blood through the heart and blood vessels回路を通る動き血行