Etymology
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inerrant (adj.)

1650s, in reference to "fixed" stars (as opposed to "wandering" planets), from Latin inerrantem (nominative inerrans) "not wandering, fixed (of stars)," from in- "not, opposite of" (see in- (1)) + errans, present participle of errare "to wander, stray, roam, rove" (see err). Meaning "unerring, free from error" is from 1785.

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Definitions of inerrant

inerrant (adj.)
not liable to error; "the Church was...theoretically inerrant and omnicompetent"-G.G.Coulton;
lack an inerrant literary sense
Synonyms: inerrable / unerring
From wordnet.princeton.edu