Lewis Short
circumactĭo (noun F) : circumago.
* Lit., a turning around, revolving (very rare): solis,Vitr. 9, 9, 15; Mart. Cap. 8, § 885.—*
* Trop., of discourse, a turning, turn, compass, Gell. 17, 20, 4.
Charlton T. Lewis, Charles Short, A Latin Dictionary