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faith

/feɪθ/

Trust, belief, or confidence without complete proof

From Latin fid- / fides (trust).

noun
*bheidh- → fides → fei/feid → faith
Proto-Indo-European
Verified
*bheidh-
reconstructed
“to trust, confide, persuade”; reconstructed ancestor

from PIE root *bheidh- "to trust, confide, persuade"). For sense evolution, compare belief . It has been accommodated...

Latin
Verified
fides; fidem
“trust, faith, confidence, reliance, belief”

from Latin fides "trust, faith, confidence, reliance, credence, belief,"

+1 more source
Old French / Anglo-French
Verified
fei, feid, foi
“faith, belief, trust, confidence, pledge”

from Old French fei, feid

Middle English
Verified
faith, feith, fay
Borrowed forms; the spelling faith was reshaped toward English abstract nouns ending in -th

from Middle English faith (also fay), borrowed

Modern English
faith

Before faith became especially associated with religion, it could describe something much more ordinary: loyalty to a person, honesty in a promise, or confidence that someone would keep their word. Its Latin ancestor, fides, belonged to the practical world of trust—and it still peeks out in fidelity, fiduciary, confidence, and even perfidy, where trust has gone disastrously wrong. French fei and feid carried the word into Middle English, where English speakers gave it a familiar-looking -th ending, alongside truth, health, and ruth. By the early fourteenth century, faith had developed its modern sense of accepting a claim despite incomplete evidence; by the late fourteenth century, it could refer specifically to religious belief. So when someone says “keep faith,” the phrase preserves the oldest image of all: a promise placed in another person’s hands.

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