tract

:  a pamphlet or leaflet of political or religious propaganda; also :  a piece of writing that is suggestive of such a tract

:  verses of Scripture (as from the Psalms) used between the gradual and the Gospel at some masses (as during penitential seasons)

1 :  an indefinite stretch of land a large tract of forest

2 :  a defined area of land 40 acre tracts

3 :  a system of body parts or organs that serve some special purpose The kidneys and bladder are part of the urinary tract.

:  a pamphlet of political or religious ideas and beliefs

1:  a system of body parts or organs that act together to perform some function the digestive tract—see gastrointestinal tract, lower respiratory tract, upper respiratory tract

2:  a bundle of nerve fibers having a common origin, termination, and function and especially one within the spinal cord or brain—called also fiber tract; see corticospinal tract, olfactory tract, optic tract, spinothalamic tract; compare fasciculus b