late 14c., araynen, "to call to account," also "to call up on a criminal charge," from Old French araisnier "speak to, address; accuse (in a law court)," from Vulgar Latin *arrationare, from Latin adrationare, from ad "to" (see ad-) + *rationare, from ratio "argumentation; reckoning, calculation" (from rat-, past participle stem of reri "to reckon, calculate," also "think" (from PIE root *re- "to reason, count"). The unetymological -g- is a 16c. overcorrection based on reign, etc. Related: Arraigned; arraigning.
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