nūtātĭo: ōnis, f. id. (post-Aug.).I A nodding: capitis, Plin. 11, 37, 49, § 135. —II A swaying. A Lit.: frequens et in utramque partem nutatio, Quint. 11, 3, 129.— B Trop., a shaking, tottering: nutatio reipublicae, Plin. Pan. 5, 6.