Etymology
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Words related to credo

*kerd- 
Proto-Indo-European root meaning "heart."

It forms all or part of: accord; cardiac; cardio-; concord; core; cordial; courage; credence; credible; credit; credo; credulous; creed; discord; grant; heart; incroyable; megalocardia; miscreant; myocardium; pericarditis; pericardium; quarry (n.1) "what is hunted;" record; recreant; tachycardia.

It is the hypothetical source of/evidence for its existence is provided by: Greek kardia, Latin cor, Armenian sirt, Old Irish cride, Welsh craidd, Hittite kir, Lithuanian širdis, Russian serdce, Old English heorte, German Herz, Gothic hairto, "heart;" Breton kreiz "middle;" Old Church Slavonic sreda "middle."
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creed (n.)

Old English creda "article or statement of Christian belief, confession of faith," from Latin credo "I believe" (see credo). Broadening 17c. to mean "a statement of belief on any subject." Meaning "what is believed, accepted doctrine" is from 1610s. Related: Creedal.

A Creed, or Rule of Faith, or Symbol, is a confession of faith for public use, or a form of words setting forth with authority certain articles of belief, which are regarded by the framers as necessary for salvation, or at least for the well-being of the Christian Church. [Philip Schaff, "The Creeds of Christendom," 1877]
credence (n.)

"belief, trust in facts derived from other than personal knowledge; that which gives a claim to belief," mid-14c., from Medieval Latin credentia "belief," from Latin credentum (nominative credens), past participle of credere "believe, trust" (see credo).

credential (n.)

"that which entitles to credit," 1756, probably a back-formation from credentials, from Medieval Latin credentialis, from credentia "belief," from Latin credere "to believe, trust" (see credo). Rare in the singular form. Earlier in English as an adjective, "confirming, corroborating" (late 15c.). As a verb, "provide with credentials," by 1828 (implied in credentialed).

credentials (n.)

"letters entitling the bearer to certain credit or confidence," 1670s, from Medieval Latin credentialis, from credentia  "belief," from Latin credere "to believe, trust" (see credo). Probably immediately as a shortening of letters credential (1520s, with French word order); earlier was letter of credence (mid-14c.). Especially in reference to the letters of authorization given by a government to an ambassador.

credible (adj.)

"believable, worthy of belief, capable of being believed, involving no impossibility; of known or obvious veracity or competence," late 14c., from Latin credibilis "worthy to be believed," from credere "to believe" (see credo). Related: Credibly.

credit (n.)

1540s, "belief, faith," from French crédit (15c.) "belief, trust," from Italian credito, from Latin creditum "a loan, thing entrusted to another," neuter past participle of credere "to trust, entrust, believe" (see credo).

The commercial sense of "confidence in the ability and intention of a purchaser or borrower to make payment at some future time" was in English by 1570s (creditor is mid-15c.); hence "sum placed at a person's disposal" by a bank, etc., 1660s. From 1580s as "one who or that which brings honor or reputation to." Meaning "honor, acknowledgment of merit," is from c. 1600.

Academic sense of "point awarded for completing a course of study" is by 1904 (short for hour of credit (1892), given for satisfactory completion of one lecture, etc., a week, usually one hour in length). Movie/broadcasting sense "acknowledgement and naming of the individual contributors" (in plural, credits) is by 1914.

Credit rating is from 1958; credit union "cooperative banking society" is 1881, American English.

creditor (n.)

mid-15c., "one to whom any return is due or payable, one to whom money is owed," from Anglo-French creditour, Old French creditor (early 14c.), from Latin creditor "truster; lender," from creditus, past participle of credere "to believe" (see credo).

credulity (n.)

early 15c., "faith, belief," from Old French credulité (12c.), from Latin credulitatem (nominative credulitas) "easiness of belief, rash confidence," noun of quality from credulus "that easily believes, trustful," from credere "to believe" (see credo). Meaning "a weak or ignorant disregard of the importance of evidence, a disposition too ready to believe," especially absurd or impossible things, is from 1540s.

credulous (adj.)

"disposed to believe, uncritical with regard to beliefs," 1570s, from Latin credulus "that easily believes, trustful," from credere "to believe" (see credo). Related: Credulously; credulousness.

Alas, my Friends, credulous incredulity is a strange matter. But when a whole Nation is smitten with Suspicion, ... what help is there? Such Nation is already a mere hypochondriac bundle of diseases; as good as changed into glass; atrabiliar, decadent; and will suffer crises. Is not Suspicion itself the one thing to be suspected, as Montaigne feared only fear? [Carlyle, "French Revolution"]