"finished, complete," mistaken back-formation from inchoate (q.v.) as though that word contained in- "not." First attested 1878 in letter from Oliver Wendell Holmes lamenting barbarisms in legal case writing (he said he found choate in a California report).
chlorofluorocarbon
chloroform
chlorophyll
chloroplast
choad
choate
chock
chock-a-block
chock-full
chocolate
chocolatey
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