(1) Reduction of a hernia or of a dislocation of any part by means of manipulation. (2) Systematic classification or orderly arrangement. (3) The reaction of protoplasm to a stimulus, by virtue of which animals and plants are led to move or act in certain definite ways in relation to their environment; the various kinds of taxis are designated by a prefix denoting the stimulus governing them; e.g., chemotaxis, electrotaxis, thermotaxis. [G. orderly arrangement]