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model: model: [16] Latin modus meant originally ‘measure’ (it came from the same Indo- European base, *met-, *med-, as produced English measure and metre). It subsequently spread out semantically to ‘size’, ‘limit’, ‘way, method’, and ‘rhythm, harmony’. From it was derived the diminutive form modulus, source of English modulate [16], module [16], and mould ‘form’.

It was altered in Vulgar Latin to *modellus, and passed into English via Italian modello and early modern French modelle. Its original application in English was to an ‘architect’s plans’, but the familiar modern sense ‘three-dimensional representation’ is recorded as early as the start of the 17th century. The notion of an ‘artist’s model’ emerged in the late 17th century, but a ‘model who shows off clothes’ is an early 20th-century development.

Other English descendants of modus include modern, modicum [15], modify [14], and of course mode [16] itself (of which mood ‘set of verb forms’ is an alteration).
=> measure, mete, metre, mode, modern, modulate, mood, mould
stereo: stereo: [19] Greek stereós meant ‘solid’. The earliest English compound noun formed from it was stereometry [16], a mathematical term denoting the measurement of solid or threedimensional objects. This was followed by stereographic [17], stereotype [18] (coined in French and originally used for a ‘solid’ printing block; the metaphorical ‘unvaried or conventional image’ emerged in the middle of the 19th century), stereoscope [19] (a viewer for producing ‘solid’ or three-dimensional images), and stereophonic ‘producing three-dimensional sound’ [20]. Stereo was used in the 19th century as an abbreviation for stereotype and stereoscopic; its use for stereophonic dates from the early 1950s.
=> stare, stork
D: fourth letter of the Roman alphabet, from Greek delta, from Phoenician and Hebrew daleth, pausal form of deleth "door," so called from its shape. The sign for "500" in Roman numerals. 3-D for "three-dimensional" is attested from 1952.
hologram (n.): 1949, coined by Hungarian-born British scientist Dennis Gabor (Gábor Dénes), 1971 Nobel prize winner in physics for his work in holography; from Greek holos "whole" (in sense of three-dimensional; see safe (adj.)) + -gram.
orb (n.): mid-15c., "sphere, globe, something spherical or circular," from Old French orbe "orb, globe" (13c.) and directly from Latin orbem (nominative orbis) "circle, disk, ring, hoop, orbit," probably related to orbita "wheel track, rut," of unknown origin. Watkins suggests a connection with the root of orchid.

A three-dimensional extension of a word originally describing two-dimensional shapes. Astronomical sense is in reference to the hollow spheres that carried the planets and stars in the Ptolemaic system. As a verb from c. 1600. Orb weaver spider is first recorded 1889.
Oz: mythical land in L. Frank Baum's "The Wonderful Wizard of Oz" (1900) and sequels; according to an anecdote written by Baum in 1903, inspired by a three-drawer desktop cabinet letter file, the last drawer labeled O-Z. As Australian slang for "Australia," attested by 1983.
secular (adj.): c. 1300, "living in the world, not belonging to a religious order," also "belonging to the state," from Old French seculer (Modern French séculier), from Late Latin saecularis "worldly, secular, pertaining to a generation or age," from Latin saecularis "of an age, occurring once in an age," from saeculum "age, span of time, generation."

According to Watkins, this is probably from PIE *sai-tlo-, with instrumental element *-tlo- + *sai- "to bind, tie" (see sinew), extended metaphorically to successive human generations as links in the chain of life. Another theory connects it with words for "seed," from PIE root *se- "to sow" (see sow (v.), and compare Gothic mana-seþs "mankind, world," literally "seed of men").

Used in ecclesiastical writing like Greek aion "of this world" (see cosmos). It is source of French siècle. Ancient Roman ludi saeculares was a three-day, day-and-night celebration coming once in an "age" (120 years). In English, in reference to humanism and the exclusion of belief in God from matters of ethics and morality, from 1850s.
solid (n.): late 14c., "three-dimensional figure," from solid (adj.). Meaning "a solid substance" is from 1690s. Compare also solidus; Latin solidus (adj.) was used as a noun meaning "an entire sum; a solid body."
stereo-: before vowels stere-, word-forming element meaning "solid, firm; three-dimensional; stereophonic," from comb. form of Greek stereos "solid," from PIE *ster- (1) "stiff, rigid, firm, strong" (cognates: Greek steresthai "be deprived of," steira "sterile," sterphnios "stiff, rigid," sterphos "hide, skin;" Latin sterilis "barren, unproductive;" Sanskrit sthirah "hard, firm," starih "a barren cow;" Persian suturg "strong;" Lithuanian storas "thick," stregti "to become frozen;" Old Church Slavonic strublu "strong, hard," sterica "a barren cow," staru "old" (hence Russian stary "old"); Gothic stairo "barren;" Old Norse stirtla "a barren cow," Old English starian "to stare," stearc "stiff, strong, rigid," steorfan "to die," literally "become stiff," styrne "severe, strict").
stereoptican (n.): "double magic lantern producing dissolving views or impressions of three-dimensionality to pictured objects," 1858, from stereo- + Greek optikon, neuter of optikos "pertaining to sight" (see optic).
three (adj.): Old English þreo, fem. and neuter (masc. þri, þrie), from Proto-Germanic *thrijiz (cognates: Old Saxon thria, Old Frisian thre, Middle Dutch and Dutch drie, Old High German dri, German drei, Old Norse þrir, Danish tre), from nominative plural of PIE root *trei- "three" (cognates: Sanskrit trayas, Avestan thri, Greek treis, Latin tres, Lithuanian trys, Old Church Slavonic trye, Irish and Welsh tri "three").

3-D first attested 1952, abbreviation of three-dimensional (1878). Three-piece suit is recorded from 1909. Three cheers for ______ is recorded from 1751. Three-martini lunch is attested from 1972. Three-ring circus first recorded 1898. Three-sixty "complete turnaround" is from 1927, originally among aviators, in reference to the number of degrees in a full circle. Three musketeers translates French les trois mousquetaires, title of the 1844 novel by Alexandre Dumas père.
eventing: "An equestrian sport in which competitors must take part in each of several contests, usually cross-country, dressage, and showjumping", 1960s: from event, in three-day event, horse trials held on three consecutive days.
stereognosis: "The mental perception of depth or three-dimensionality by the senses, usually in reference to the ability to perceive the form of solid objects by touch", Early 20th century: from Greek stereos 'solid' + gnōsis 'knowledge'.