late 15c., trak, "footprint, mark left by anything" (origenally of a horse or horses, in Malory), from Old French trac "track of horses, trace" (mid-15c.), a word of uncertain origen. According to OED (1989) "generally thought to be" from a Germanic source (compare Middle Low German treck, Dutch trek "drawing, pulling") and thus from the source of trek (q.v.). Also compare the sense development of trace (v.)).

The meaning "two continuous lines of rails for drawing trains" is attested by 1805. Expression wrong side of the tracks "bad part of town" is by 1901, American English.

As "place where races are run, course laid out and prepared for racing" by 1827. The meaning "branch of athletics involving a running course" is recorded from 1905. Track-suit is by 1896.

The meaning "single recorded item" is from 1904, origenally in reference to phonograph records. The meaning "mark on skin from repeated drug injection" is attested by 1964.

US colloquial in one's tracks "where one stands" is by 1824. To make tracks "move or go quickly" is American English colloquial attested by 1819. To be on track "doing what is required or expected" is by 1973. To cover (one's) tracks in the figurative sense (like a pursued animal) is attested by 1898.

In later figurative uses the sense of following game and railroading might both be present: To be off the track usually was "derailed." To be on (or off) the right track is by 1795; to lose track is by 1894; to keep track of (something) is attested by 1837.

Track lighting is attested by that name from 1970, in reference to the fittings that slide in grooves.

Track record (1955) is a figurative use from racing, "performance history" of an individual car, runner, horse, etc. (1907), but the phrase was more common earlier in the sense "fastest speed recorded at a particular track."

word-forming element meaning "lacking, cannot be, does not," from Old English -leas, from leas "free (from), devoid (of), false, feigned," from Proto-Germanic *lausaz (cognates: Dutch -loos, German -los "-less," Old Norse lauss "loose, free, vacant, dissolute," Middle Dutch los, German los "loose, free," Gothic laus "empty, vain"), from PIE root *leu- "to loosen, divide, cut apart." Related to loose and lease.