convenience (n.)youdaoicibaDictYouDict[convenience 词源字典]
late 14c., "agreement, conformity," from Latin convenientia "meeting together, agreement, harmony," from conveniens, present participle of convenire (see convene). Meaning "suitable, adapted to existing conditions" is from c. 1600; that of "personally not difficult" is from 1703.[convenience etymology, convenience origin, 英语词源]