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"area," late 15c., "period or lapse of time," from Latin tractus "track, course, space, duration," lit, "a drawing out or pulling," from stem of trahere "to pull, draw," from PIE root *tragh- "to draw, drag, move" (cf. Slovenian trag "trace, track," Middle Irish tragud "ebb," perhaps with a variant form *dhragh-; see drag (v.)). The meaning "stretch of land or water" is first recorded 1550s. Specific U.S. sense of "plot of land for development" is recorded from 1912; tract houses attested from 1963.
"little book, treatise" mid-12c., probably a shortened form of Latin tractatus "a handling, treatise, treatment," from tractare "to handle" (see treat). Not in any other language, according to OED.
An elongated assembly of tissue or organs having a common origin, function, and termination, or a serial arrangement having a common function.
A bundle of nerve fibers having a common origin, termination, and function.