Definition of tracts:
(n) :
An area or expanse.
(n) :
(anatomy) A series of connected body organs, such as the digestive tract.
(n) :
A small booklet such as a pamphlet, often for promotional or informational uses.
(n) :
A brief treatise or discourse on a subject.
(n) :
Continued or protracted duration, length, extent
(n) :
A commentator's view or perspective on a subject.