Webster's English Dictionary

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taxis

tax.is \'tak-s*s\ \'tak-.se-z\ n or tax.es [Gk, lit., arrangement, order, 
   fr. tassein to arrange - more at TACT] pl ICS 1: the manual restoration of 
   a displaced body part; specif : manual  reduction of a hernia 2a: reflex 
   translational or orientational movement by a freely motile and u su. simple 
   organism in relation to a source of stimulation (as a light or a 
   temperature or chemical gradient) 2b: a reflex reaction involving such 
   movement