An Etymological Dictionary of Astronomy and Astrophysics

The continuous movement of something from place to place or in an enclosed space. → meridional circulation.

Etymology (EN): M.E. circulacioun, from M.Fr. circulation or directly from L. circulationem, from circulare “to form a circle,” from circulus “small ring,” → circle.

Etymology (PE): Parhuneš, verbal noun from parhunidan, from parhun, → circle.