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; chemotaxis, electrotaxis, thermotaxis.