tract 1 
(trăkt)
(trăkt)n.
1.
a. An expanse of land or water.
b. A specified or limited area of land: developing a 30-acre tract.
2. Anatomy
a. A system of organs and tissues that together perform a specialized function: the alimentary tract.
b. A bundle of nerve fibers having a common origin, termination, and function.
3. Archaic A stretch or lapse of time.
[Middle English, period of time, from Latin tractus, course, space, period of time, from past participle of trahere, to draw.]