competent (adj.)youdaoicibaDictYouDict[competent 词源字典]
late 14c., "suitable," from Old French competent "sufficient, appropriate, suitable," from Latin competentem (nominative competens), present participle of competere "coincide, agree" (see compete). Meaning "able, fit" is from 1640s. Legal sense is late 15c.[competent etymology, competent origin, 英语词源]