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Noun tract has 4 senses
  1. tract, piece of land, piece of ground, parcel of land, parcel - an extended area of land
    --1 is a kind of geographical area, geographic area, geographical region, geographic region
    --1 has particulars:
     baseball diamond, diamond, infield; center field, center; left field, left; outfield; right field, right; short; yard, railway yard; oasis; battlefield, battleground, field of battle, field of honor, field; minefield; breeding ground; clearing, glade; field; field of fire; grounds; playing field, athletic field, playing area, field; industrial park; grassland; mud flat; parade ground; fairground; midway; fairway; park, parkland; park, commons, common, green; picnic area, picnic ground; public square, square; toll plaza; range; sector; site, land site; subdivision; mine field; terrain; plot, plot of ground, patch; lot; yard
  2. tract - a system of body parts that together serve some particular purpose
    --2 is a kind of
    --2 has particulars: respiratory tract; urinary tract
  3. tract, pamphlet - a brief treatise on a subject of interest; published in the form of a booklet
    --3 is a kind of treatise
  4. nerve pathway, tract, nerve tract, pathway - a bundle of mylenated nerve fibers following a path through the brain
    --4 is a kind of white matter, substantia alba
    --4 has particulars: peduncle, cerebral peduncle; corpus callosum
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