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Origin and history of duality

duality(n.)

"twofold nature, state of being two or divided in two," late 14c., from Late Latin dualitas, from Latin dualis "that contains two; the dual number, duality," from duo "two" (from PIE root *dwo- "two").

also from late 14c.

Entries linking to duality

*dwo-

Proto-Indo-European root meaning "two."

It might form all or part of: anadiplosis; balance; barouche; between; betwixt; bezel; bi-; binary; bis-; biscuit; combination; combine; deuce; deuterium; Deuteronomy; di- (1) "two, double, twice;" dia-; dichotomy; digraph; dimity; diode; diphthong; diploid; diploma; diplomacy; diplomat; diplomatic; diplodocus; double; doublet; doubloon; doubt; dozen; dual; dubious; duet; duo; duodecimal; duplex; duplicate; duplicity; dyad; epididymis; hendiadys; pinochle; praseodymium; redoubtable; twain; twelfth; twelve; twenty; twi-; twice; twig; twilight; twill; twin; twine; twist; 'twixt; two; twofold; zwieback.

It might also be the source of: Sanskrit dvau, Avestan dva, Greek duo, Latin duo, Old Welsh dou, Lithuanian dvi, Old Church Slavonic duva, Old English twa, twegen, German zwei, Gothic twai "two;" first element in Hittite ta-ugash "two years old."

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    Trends of duality

    adapted from books.google.com/ngrams/ with a 7-year moving average; ngrams are probably unreliable.

    More to explore

    dichotomy
    c. 1600, "a cutting in two, division into two classes;" 1630s, "state of having a dual arrangement or order," from Latinized form of Greek dikhotomia "a cutting in half," from dikho-, combining form of dikha "in two, asunder" (from or related to dis "twice," from PIE root *dwo- "
    property
    c. 1300, properte, "nature, quality, distinctive character always present in an individual or class," later "possession, land or goods owned, things subject to ownership" (early 14c., but this sense is rare before 17c.), from an Anglo-French modification of Old French proprete, "
    observe
    late 14c., observen, "to hold to (a manner of life or course of conduct), carry out the dictates of, attend to in practice, to keep, follow," from Old French observer, osserver "to observe, watch over, follow" (10c.), from Latin observare "watch over, note, heed, look to, attend
    shrine
    Middle English shrine "repository in which a holy object or the relics of a saint are kept," from late Old English scrin "ark (of the covenant); chest, coffer; case for relics," from Latin scrinium "case or box for keeping papers," a word of unknown origin. A widespread Latin bor
    set
    Middle English setten, from Old English settan (transitive) "cause to sit; make or cause to rest as on a seat; cause to be put, placed, or seated;" also "put in a definite place," also "arrange, fix adjust; fix or appoint (a time) for some affair or transaction," and "cause (thou
    intervention
    early 15c., intervencioun, "intercession, intercessory prayer," Late Latin interventionem (nominative interventio) "an interposing, a giving security," literally "a coming between," noun of action from past-participle stem of Latin intervenire "to come between, interrupt," from i
    clever
    1580s, "handy, dexterous, having special manual ability," apparently from East Anglian dialectal cliver "expert at seizing," perhaps from East Frisian klüfer "skillful," or Norwegian dialectic klover "ready, skillful," and perhaps influenced by Old English clifer "claw, hand" (ea
    diamond
    mid-14c., diamaunt, diamond, "extremely hard and refractive precious stone made of pure or nearly pure carbon," from Old French diamant, from Medieval Latin diamantem (nominative diamas), from Vulgar Latin *adiamantem (which was subsequently altered by influence of the many Greek
    versatile
    c. 1600, "inconstant," from Latin versatilis "turning, revolving, moving, capable of turning with ease to varied subjects or tasks," from past participle stem of versare "keep turning, be engaged in something, turn over in the mind," frequentative of vertere "to turn" (from PIE r
    grail
    c. 1300, gral, "the Holy Grail," from Old French graal, greal "Holy Grail; cup," earlier "large shallow dish, basin," from Medieval Latin gradalis, also gradale, grasale, "a flat dish or shallow vessel." The original form is uncertain; the word is perhaps ultimately from Latin cr

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    Dictionary entries near duality
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