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also anglicized as ataxy, "irregularity of bodily functions," 1610s, "confusion, disorder," medical Latin, from Greek ataxia, from a-, privative prefix, + taxis "arrangement, order," from stem of tassein "to arrange" (see tactics). Pathological sense is attested from 1660s.
ataxia a·tax·i·a (ə-tāk'sē-ə) or a·tax·y (ə-tāk'sē)
Loss of the ability to coordinate muscular movement. Also called dyssynergia, incoordination.