The Collaborative International Dictionary of English v.0.48:

Taxis \Tax"is\, n. [NL., fr. Gr. ta`xis a division or
   arrangement, fr. ta`ssein to arrange.]
   1. (Surg.) Manipulation applied to a hernial tumor, or to an
      intestinal obstruction, for the purpose of reducing it.
      --Dunglison.
      [1913 Webster]

   2. In technical uses, as in architecture, biology, grammar,
      etc., arrangement; order; ordonnance.
      [Webster 1913 Suppl.]

   3. a reflexive movement by a motile organism by which it
      moves or orients itself in relation to some source of
      stimulation; as, chemotaxis, the motion toward or away
      from gradients of certain chemical compounds.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

-taxis \-tax"is\, n.
   combining form for taxis[3].
   [PJC]

WordNet (r) 3.0 (2006):

taxis
    n 1: a locomotor response toward or away from an external
         stimulus by a motile (and usually simple) organism
    2: the surgical procedure of manually restoring a displaced body
       part

The Free On-line Dictionary of Computing (30 December 2018):

Taxis

   ["A Language Facility for Designing Database-Intensive
   Applications", J. Mylopoulos et al, ACM Trans Database Sys
   5(2):185-207 (June 1980)].