n.
Pronunciation: ' tak-s ə s
Function: noun
Inflected Form: plural tax · es \ - ˌ s ē z \
Etymology: Greek, literally, arrangement, order, from tassein to arrange
Date: 1899
1 : reflex translational or orientational movement by a freely motile and usually simple organism in relation to a source of stimulation (as a light or a temperature or chemical gradient)
2 : a reflex reaction involving a taxis