qualitative (adj.)youdaoicibaDictYouDict[qualitative 词源字典]
early 15c., "that produces a (physical) quality," from Medieval Latin qualitativus "relating to quality," from stem of Latin qualitas "a quality, property, nature" (see quality). Meaning "concerned with quality" is from c. 1600 in English, from French qualitatif or Medieval Latin qualitativus. Related: Qualitatively.[qualitative etymology, qualitative origin, 英语词源]