Online Etymology Dictionary

timeless (adj.): "eternal," 1620s, from time (n.) + -less. Earlier it meant "ill-timed" (1550s). Related: Timelessly; timelessness.
timely (adv.): late Old English timlic "quickly, soon;" see time (n.) + -ly (2). As an adjective meaning "occurring at a suitable time" it is attested from c. 1200.
timeous (adj.): "timely," late 15c., from time (n.) + -ous. Related: Timeously.
timepiece (n.): 1765, from time (n.) + piece (n.).
timer (n.): 1908 as a mechanical device, agent noun from time (v.).
timetable (n.): 1838, originally of railway trains, from time (n.) + table (n.).
timewise (adv.): also time-wise, 1898, from time (n.) + wise (n.).
timid (adj.): 1540s, from Middle French timide "easily frightened, shy" (16c.) and directly from Latin timidus "fearful, afraid, cowardly," from timere "to fear," of uncertain origin. Related: Timidly; timidness.
timidity (n.): 1590s, from Latin timiditas "fearfulness, faint-heartedness, cowardice," from timidus "fearful, afraid" (see timid).
timing (n.): mid-13c., "a happening," verbal noun from time (v.). From 1590s as "the noting or recording of time;" 1915 as "coordination of moving parts in a machinery."
timocracy (n.): 1580s, from Middle French tymocracie, from Medieval Latin timocratia (13c.), from Greek timokratia, from time "honor, worth" (related to tiein "to place a value on, to honor," from PIE *kwi-ma-, suffixed form of root *kweie- (1) "to value, honor") + -kratia "rule" (see -cracy). In Plato's philosophy, a form of government in which ambition for honor and glory motivates the rulers (as in Sparta). In Aristotle, a form of government in which political power is in direct proportion to property ownership. Related: Timocratic; timocratical.
Timon (n.): "misanthrope," from Timon, name of a misanthrope who lived in Athens during the Peloponnesian War (431-404 B.C.E.), hero of Shakespeare's "Timon of Athens" (c. 1605).
Timor: island in the East Indies, Malay timur "east" (in reference to Java and Sumatra). Related: Timorese.
timorous (adj.): early 15c., from Middle French timoureus (14c.), from Medieval Latin timorosus "fearful," from Latin timor "fear, dread, apprehension, anxiety; religious awe, reverence," from timere "to fear, be afraid, dread," of unknown origin. Some early senses in English seem to show confusion with Middle English temerous "rash" (see temerity). Related: Timorously; timorousness.
Timothy: masc. proper name, from French Timothée, from Latin Timotheus, from Greek Timotheos, literally "honoring God," from time "honor, respect" (see timocracy) + theos "god" (see theo-).
timothy (n.): 1747, short for timothy grass (1736), American English name for "cat-tail grass" (Phleum pratense), a native British grass introduced to the American colonies and cultivated there from c. 1720. Said since 1765 to be so called for a certain Timothy Hanson, who is said to have promoted it in the Carolinas as an agricultural plant.
timpani (n.): 1876, plural of timpano (1740), from Italian timpani "drums," from Latin tympanum "drum" (see tympanum). Related: Timpanist.
tin (n.): Old English tin, from Proto-Germanic *tinom (source also of Middle Dutch and Dutch tin, Old High German zin, German Zinn, Old Norse tin), of unknown origin, not found outside Germanic.

Other Indo-European languages often have separate words for "tin" as a raw metal and "tin plate;" such as French étain, fer-blanc. Pliny refers to tin as plumbum album "white lead," and for centuries it was regarded as a form of silver debased by lead; hence its figurative use for "mean, petty, worthless." The chemical symbol Sn is from Late Latin stannum (see stannic).

Meaning "container made of tin" is from 1795. Tin-can is from 1770; as naval slang for "destroyer," by 1937. Tin-type in photography is from 1864. Tin ear "lack of musical discernment" is from 1909. Tin Lizzie "early Ford, especially a Model T," first recorded 1915.
Tin Pan Alley (n.): "hit song writing business," 1907, from tin pan, slang for "a decrepit piano" (1882). The original one was "that little section of Twenty-eighth Street, Manhattan, that lies between Broadway and Sixth Avenue," home to many music publishing houses.
Tina: fem. proper name, short for Cristina, etc.
tinct (n.): "color, tint," c. 1600, from Latin tinctus "a dyeing," from tingere "to dye" (see tincture).
tincture (n.): c. 1400, "a coloring, dye," from Latin tinctura "act of dyeing or tingeing," from tinctus "dye," past participle of tingere "to tinge, dye, soak in color," originally merely "to moisten, wet, soak," from PIE root *teng- "to soak" (source also of Old High German dunkon "to soak," Greek tengein "to moisten"). Meaning "solution of medicine in a mixture of alcohol" is first recorded 1640s. The verb is recorded from 1610s. Related: Tinctured.
tinder (n.): "dry, inflammable substance," Old English tynder, from or related to tendan "to kindle," from Proto-Germanic *tund- "ignite, kindle" (source also of Gothic tandjan, Swedish tända, German zünden "to kindle").
tinderbox (n.): also tinder-box, "box in which tinder and flint are kept," 1520s, from tinder + box (n.); figurative sense of " 'inflammable' person or thing" is attested from 1590s.
tine (n.): mid-14c., from Old English tind "spike, beak, prong, tooth of a fork," a general Germanic word (compare Old High German zint "sharp point, spike," Old Norse tindr "tine, point, top, summit," German Zinne "pinnacle"), of unknown origin (see zinc).
tinea (n.): late 14c., "ringworm," from Latin tinea "a gnawing worm, moth, bookworm," of uncertain origin. From 1650s as a type of moth (the larvae of which eat clothes, papers, etc.).
tinfoil (n.): also tin-foil, late 15c., from tin (n.) + foil (n.).
tinge (v.): late 15c., "to dye, color slightly," from Latin tingere "to dye, color" (see tincture). Related: Tinged. The noun is first recorded 1752.
tingle (v.): late 14c., "to have a ringing sensation when hearing something," also "to have a stinging or thrilling feeling," variation of tinkelen (see tinkle). Related: Tingled; tingling. The noun is first recorded 1700 in reference to sound, 1848 in reference to sensation.
tingly (adj.): 1898, from tingle + -y (2). Related: Tingliness.
tinhorn (adj.): "petty but flashy," 1857, from tin + horn (n.); originally of low-class gamblers, from the tin cans they used for shaking dice.
tink: late 14c. (v.); c. 1600 (n.), echoic.
tinker (n.): "mender of kettles, pots, pans, etc.," late 14c. (mid-13c. as a surname), of uncertain origin. Some connect the word with the sound made by light hammering on metal. Tinker's damn "something slight and worthless" is from 1824, probably preserving tinkers' reputation for free and casual use of profanity; the plain and simple etymology is not good enough for some writers, and since 1877 an ingeniously elaborate but baseless derivation has been circulated claiming the second word is really dam.
tinker (v.): 1590s, "to work as a tinker," from tinker (n.). Meaning "work imperfectly, keep busy in a useless way," is first found 1650s. Related: Tinkered; tinkering.
tinkle (v.): "to make a gentle ringing sound," late 14c., possibly a frequentative form of tinken "to ring, jingle," perhaps of imitative origin. Meaning "to urinate" is recorded from 1960, from childish talk. Related: Tinkled; tinkling. As a noun from 1680s.
tinman (n.): "tinsmith," 1610s, from tin (n.) + man (n.).
tinnitus (n.): 1843, from Latin tinnitus "a ringing, jingling," from tinnire "to ring, tinkle" (see tintinnabulation).
tinny (adj.): 1550s, "of tin," from tin + -y (2). Used figuratively (of sounds, etc.) since 1877.
tinsel (n.): mid-15c., "a kind of cloth made with interwoven gold or silver thread," from Middle French estincelle "spark, spangle" (see stencil (n.)). "In 14-15th c. Fr., the s of es- had long been mute" [OED]. Meaning "very thin sheets or strips of shiny metal" is recorded from 1590s. Figurative sense of "anything showy with little real worth" is from 1650s, suggested from at least 1590s. First recorded use of Tinseltown for "Hollywood" is from 1972.
tinsmith (n.): 1785, from tin + smith (n.).
tint (n.): "color," 1717, alteration of tinct (c. 1600), from Latin tinctus "a dyeing," from tingere "to dye" (see tincture); influenced by Italian tinta "tint, hue," from Latin tinctus.
tint (v.): 1756 (implied in tinted), from tint (n.). Related: Tinting.
tintinnabulation (n.): "the ringing of bells," 1823, from Latin tintinnabulum "bell," from tintinnare "to ring, jingle" (reduplicated form of tinnire "to ring," from an imitative base) + instrumental suffix -bulum. Earlier forms in English were adjectives tintinnabulary (1787), tintinnabulatory (1827), and noun tintinnabulum "small bell" (late 14c.).
tiny (adj.): 1590s, from tyne "very small" (c. 1400, perhaps from tine) + -y (2).
Tioga: place in New York state, from Mohawk (Iroquoian) teyo:ke "junction, fork."
tip (v.1): c. 1300, "to knock down, overturn, topple, knock askew" (transitive), of uncertain origin, possibly from Scandinavian (compare Swedish tippa "to tip, dump"), or from a special use of tip (n.). Intransitive sense of "to fall over, be overturned" is from mid-15c. Related: Tipped; tipping. To tip the scales at "weigh (so much" is from 1879. Tipping point attested by 1972. To tip (one's) hand "reveal one's intentions" is from 1907, an image from poker-playing.
tip (n.1): c. 1400, "extreme end of something, top of something round or pointed, metal attachment to the end of something," from Middle Low German or Middle Dutch tip "utmost point, extremity, tip" (compare German zipfel, a diminutive formation); or from a Scandinavian source (compare Old Norse typpi).
tip (v.2): "give a small present of money to," c. 1600, originally "to give, hand, pass," thieves' cant, perhaps from tip (v.3) "to tap." The meaning "give a gratuity to" is first attested 1706. The noun in this sense is from 1755; the noun meaning "piece of confidential information" is from 1845; and the verb in the sense "give private information to" is from 1883.

The popularity of the tale of the word's supposed origin as an acronym in mid-18th century English taverns seems to be no older than Frederick W. Hackwood's 1909 book "Inns, Ales and Drinking Customs of Old England," where it was said to stand for To insure promptitude (in the form to insure promptness the anecdote is told from 1946). A reviewer of the book in the "Athenaeum" of Oct. 2, 1909, wrote, "We deprecate the careless repetition of popular etymologies such as the notion that "tip" originated from an abbreviated inscription on a box placed on the sideboard in old coaching-inns, the full meaning of which was "To Insure Promptitude." Also see here.
tip (v.3): c. 1200, "to strike, occur suddenly," of uncertain origin, possibly from Low German tippen "to poke, touch lightly," related to Middle Low German tip "end, point," and thus connected to tip (n.); or else related to tap (v.1). Meaning "strike sharply but lightly" is from 1560s. Sports sense is from 1816, originally in cricket. Related: Tipped; tipping.
tip (n.2): "a light, sharp blow or tap," mid-15c., from tip (v.3).