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constant (adj.)[constant 词源字典]: late 14c., "steadfast, resolute," from Old French constant (14c.) or directly from Latin constantem (nominative constans) "standing firm, stable, steadfast, faithful," present participle of constare, from com- "together" (see com-) + stare "to stand," from PIE root *sta- "to stand" (see stet). Of actions and conditions from 1650s. Related: Constantly.[constant etymology, constant origin, 英语词源]
constant (n.): 1832 in mathematics and physics, from constant (adj.).
Constantinople: the proper name from 330 C.E. to 1930 C.E. of what is now Istanbul, from Greek Konstantinou polis "Constantine's city," named for Roman emperor Flavius Valerius Aurelius Constantinus, whose name is derived from Latin constans (see constant (adj.)).
constellation (n.): early 14c., from Old French constellacion "constellation, conjuncture (of planets)," from Late Latin constellationem (nominative constellatio) "set with stars," from constellatus, from Latin com- "with" (see com-) + past participle of stellare "to shine," from stella "star" (see star). Originally in astrology, of position of planets ("stars") in regard to one another on a given day, usually one's birth day, as a determination of one's character. "I folwed ay myn inclinacioun/By vertu of my constillacioun" (Chaucer, "Wife's Prologue," c. 1386). Modern astronomical sense is from 1550s.
consternate (v.): 1650s, from Latin consternatus, past participle of consternare (see consternation).
consternation (n.): 1610s, from French consternation "dismay, confusion," from Latin consternationem (nominative consternatio) "confusion, dismay," from consternat-, past participle stem of consternare "overcome, confuse, dismay, perplex, terrify, alarm," probably related to consternere "throw down, prostrate," from com-, intensive prefix (see com-), + sternere "to spread out" (see stratum).
constipate (v.): 1530s, in part a back-formation from constipation, in part from Latin constipatus, past participle of constipare (see constipation). Earlier as an adjective (early 15c.); an earlier verb in this sense was constipen (late 14c.). Related: Constipated; constipating.
constipation (n.): c. 1400, "constriction of tissue," from Late Latin constipationem (nominative constipatio), noun of state from Latin constipare "to press or crowd together," from com- "together" (see com-) + stipare "to cram, pack" (see stiff (adj.)). Specifically of the bowel condition since 1540s.
constituency (n.): "body of constituents," 1806, from constituent + -cy.
constituent (n.): 1620s, "one who appoints or elects a representative," from Latin constituentem (nominative constituens), present participle of constituere (see constitute). The notion is "to make up or compose" a body by appointing or electing a representative. As an adjective, "essential, characteristic," from 1660s; "that appoints or elects a representative to a body," from 1714.
constitute (v.): mid-15c., verb use of adjective constitute, "made up, formed" (late 14c.), from Latin constitutus "arranged, settled," past participle adjective from constituere "to cause to stand, set up, fix, place, establish, set in order; form something new; resolve," of persons, "to appoint to an office," from com-, intensive prefix (see com-), + statuere "to set," from PIE root *sta- "to stand," with derivatives meaning "place or thing that is standing" (see stet). Related: Constituted; constituting.
constitution (n.): mid-14c., "law, regulation, edict," from Old French constitucion (12c.) "constitution, establishment," and directly from Latin constitutionem (nominative constitutio) "act of settling, settled condition, anything arranged or settled upon, regulation, order, ordinance," from constitut-, past participle stem of constituere (see constitute).

Meaning "action of establishing" is from 1580s; that of "way in which a thing is constituted" is from c. 1600; that of "physical health, strength and vigor of the body" is from 1550s; of the mind, "temperament, character" from 1580s. Sense of "mode of organization of a state" is from c. 1600; that of "system of principles by which a community is governed" dates from 1730s; especially of a document of written laws since the U.S. and French constitutions, late 18c.
constitutional (adj.): 1680s, "pertaining to a person's (physical or mental) constitution," from constitution + -al (1). Meaning "beneficial to bodily constitution" is from 1750. Meaning "authorized or allowed by the political constitution" is from 1765. Constitutional monarchy is recorded from 1801, from French. Related: Constitutionally.
constitutional (n.): "a constitutional walk," 1829, probably originally among university students, from constitutional (adj.) in the "beneficial to bodily health" sense.
constitutionalism (n.): 1832, "constitutional system of government;" occasionally also "constitutionality;" from constitutional (adj.) + -ism.
constitutionality (n.): 1787, "quality of being in accord with a constitution," from constitutional (adj.) + -ity.
constitutive (adj.): c. 1600, "having the power of establishing," also "elemental, essential," from Medieval Latin *constitutivus, from constitut-, past participle stem of constituere (see constitute). Related: Constitutively.
constrain (v.): early 14c., constreyen, from stem of Old French constreindre (Modern French contraindre) "restrain, control," from Latin constringere "to bind together, tie tightly, fetter, shackle, chain," from com- "together" (see com-) + stringere "to draw tight" (see strain (v.)). Related: Constrained; constraining.
constraint (n.): late 14c., "distress, oppression," from Old French constreinte "binding, constraint, compulsion" (Modern French contrainte), fem. noun from constreint, past participle of constreindre, from Vulgar Latin *constrinctus, from Latin constrictus (see constrain). Meaning "coercion, compulsion" is from 1530s.
constrict (v.): early 15c., from Latin constrictus, past participle of constringere "compress" (see constrain). A direct borrowing from Latin of the same word which, via French, became constrain. Related: Constricted; constricting.