taxis

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Biology The responsive movement of a free-moving organism or cell toward or away from an external stimulus, such as light.
• noun Medicine The moving of a body part by manipulation into normal position, as after a dislocation, fracture, or hernia.

from The Century Dictionary.

• noun The orientation, locomotion, or migration of a cell or of an organism in relation to an external substance or form of energy.
• noun In surgery, an operation by which parts which have quitted their natural situation are replaced by manipulation, as in reducing hernia, etc.
• noun In ancient architecture, that disposition which assigns to every part of a building its just dimensions. It is synonymous with ordonnance in modern architecture.
• noun In Greek antiquity, a division of troops corresponding more or less closely to the modern battalion; also, a larger division of an army, as a regiment or a brigade.
• noun In zoology, classification; taxonomy; taxology.
• noun In grammar and rhetoric, arrangement; order.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Surg.) Manipulation applied to a hernial tumor, or to an intestinal obstruction, for the purpose of reducing it.
• noun In technical uses, as in architecture, biology, grammar, etc., arrangement; order; ordonnance.
• noun a reflexive movement by a motile organism by which it moves or orients itself in relation to some source of stimulation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Plural form of taxi.
• noun biology The movement of an organism in response to a stimulus.
• noun medicine The manipulation of a body part into its normal position after injury.
• noun rhetoric The arrangement of the parts of a topic.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the surgical procedure of manually restoring a displaced body part
• noun a locomotor response toward or away from an external stimulus by a motile (and usually simple) organism