Online Etymology Dictionary

conspicuous (adj.): 1540s, from Latin conspicuus "visible, open to view, striking," from conspicere "to look at, observe, see, notice," from com-, intensive prefix (see com-), + specere (see scope (n.1)). Phrase conspicuous by its absence (1859) is said to be from Tacitus ("Annals" iii.76), in a passage about certain images: "sed præfulgebant ... eo ipso quod effigies eorum non visebantur."
conspiracy (n.): mid-14c., from Anglo-French conspiracie, Old French conspiracie "conspiracy, plot," from Latin conspirationem (nominative conspiratio) "agreement, union, unanimity," noun of action from conspirare (see conspire); earlier in same sense was conspiration (early 14c.), from French conspiration (13c.), from Latin conspirationem. An Old English word for it was facengecwis. As a term in law, from 1863. Conspiracy theory is from 1909.
conspirator (n.): c.1400, conspyratour, from Old French conspirateur, from Latin conspiratorem (nominative conspiratorio), noun of action from conspirat-, past participle stem of conspirare (see conspire). Fem. form conspiratress is from mid-18c. Related: Conspiratorial; conspiratorially; conspiratory.
conspire (v.): late 14c., from Old French conspirer (14c.), from Latin conspirare "to agree, unite, plot," literally "to breathe together," from com- "together" (see com-) + spirare "to breathe" (see spirit (n.)). Or perhaps the notion is "to blow together" musical instruments, i.e., "To sound in unison." Related: Conspired; conspiring.
constable (n.): c.1200, "chief household officer, justice of the peace," from Old French conestable (12c., Modern French connétable), "steward, governor," principal officer of the Frankish king's household, from Late Latin comes stabuli, literally "count of the stable" (established by Theodosian Code, c.438 C.E.), hence, "chief groom." See count (n.). Second element is from Latin stabulum "stable, standing place" (see stable (n.)). Probably a translation of a Germanic word. Meaning "an officer of the peace" is from c.1600, transferred to "police officer" 1836. French reborrowed constable 19c. as "English police."
constabulary (n.): 1630s, "district under a constable," from Medieval Latin constabularia, from constabulus, Latinized form of Old French conestable (see constable). Meaning "organized body of constables" is from 1837. Earlier (mid-15c.) as an adjective, "pertaining to a constable."
constance (n.): mid-14c., "steadfastness," from Old French constance "steadfastness, permanence" (14c.), from Latin constantia (source of Italian costanza, Spanish constancia), noun of action from constantem (see constant (adj.)). Obsolete since 17c. except as a given name for a girl, which enjoyed a mild popularity in U.S. c.1945-1955.
constancy (n.): 1520s, from constance + -cy.
constant (adj.): 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 (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.
constriction (n.): c.1400, from Latin constrictionem (nominative constrictio), noun of action from past participle stem of constringere "compress" (see constrain).
constrictive (adj.): c.1400, from Late Latin constrictivus, from Latin constrictus (see constrict).
constrictor (n.): 1735, agent noun in Latin form from constrict.
construct (v.): early 15c., from Latin constructus, past participle of construere "to heap up" (see construction). Related: Constructed; constructing.
construct (n.): 1871 in linguistics, 1890 in psychology, 1933 in the general sense of "anything constructed;" from construct (v.).
construction (n.): late 14c., from Old French construction or directly from Latin constructionem (nominative constructio), from construct-, past participle stem of construere "pile up together, accumulate; build, make, erect," from com- "together" (see com-) + struere "to pile up" (see structure (n.)).
constructionist (n.): 1844, in reference to the U.S. Constitution, from construction + -ist. Usually with strict or loose.
constructive (adj.): early 15c., "derived by interpretation," from Middle French constructif or from Medieval Latin constructivus, from Latin construct-, past participle stem of construere "to heap up" (see construction). Meaning "pertaining to construction" is from 1817; "having the quality of constructing" is from 1841. Related: Constructively. Constructive criticism is attested by 1841.
constructivism (n.): 1924, in reference to an abstract artistic movement begun in Russia c.1920, from Russian konstruktivizm. Related: Constructivist (1928).
construe (v.): late 14c., from Late Latin construere "to relate grammatically," in classical Latin "to build up, pile together" (see construction); also see construct (v.), which is a later acquisition of the same word. Related: Construed; construing; construal.
consubstantial (adj.): late 15c., a term in the theology of the trinity, from Church Latin consubstantialis, from com- "with" (see com-) + substantia (see substance). In general use from 1570s. Related: Consubstantiality.
consubstantiation (n.): 1590s, from Church Latin consubstantionem (nominative consubstantio), noun of action from past participle stem of consubstantiare, from com- "with" (see com-) + substantia (see substance). Related: Consubstantiate.
consuetude (n.): late 14c., from Middle French consuetude, from Latin consuetudo, from consuetus, past participle of consuescere "to accustom" (see custom).
consul (n.): late 14c., "magistrate in ancient Rome," from Old French consule and directly from Latin consul "magistrate in ancient Rome," probably originally "one who consults the Senate," from consulere "to deliberate, take counsel" (see consultation).

Modern sense began with use as appellation of various foreign officials and magistrates, "a representative chosen by a community of merchants living in a foreign country; an agent appointed by a government or ruler to represent the interests of its subjects and traders in a foreign place" (c.1600), an extended sense that developed 13c. in the Spanish form of the word.
consular (adj.): early 15c., from Latin consularis, from consul (see consul).
consulate (n.): late 14c., "government of Rome by the consuls," from Latin consulatus "office of a consul," from consul (see consul). Also used in reference to the consular government of France from 1799-1804. In reference to the office of a modern consul, from 1702.
consult (v.): 1520s, from Middle French consulter (16c.), from Latin consultare "consult, take the advice of," frequentative of consulere "to take counsel, meet and consider" (see consultation). Related: Consulted; consulting.
consultant (n.): 1690s, of persons going to oracles, from consult + -ant. Of physicians, from 1878; meaning "one qualified to give professional advice" is first attested 1893 in a Sherlock Holmes story. Related: Consultancy (1955).
consultation (n.): early 15c., from Middle French consultation, from Latin consultationem (nominative consultatio), from past participle stem of consultare "consult, ask counsel of; reflect, consider maturely," frequentative of consulere "to deliberate, consider," originally probably "to call together," as in consulere senatum "to gather the senate" (to ask for advice), from com- "with" (see com-) + *selere "take, gather (the Senate) together," from PIE root *sal- "to take, seize."
consultative (adj.): 1580s, from Medieval Latin *consultativus, from consultat-, past participle stem of consultare (see consultation).
consumable (adj.): 1640s, from consume + -able.
consumables (n.): "articles of consumption," 1802, from consumable.