The Collaborative International Dictionary of English v.0.48:

Circumposition \Cir`cum*po*si"tion\, n. [L. circumpositio, fr.
   circumponere, - positium, to place around.]
   The act of placing in a circle, or round about, or the state
   of being so placed. --Evelyn.
   [1913 Webster] Circumrotary