economical (adj.)youdaoicibaDictYouDict[economical 词源字典]
1570s, "pertaining to household management;" from economic + -al (1). Sense of "pertaining to political economy" is from 1781, but that sense more commonly goes with economic, and the main modern sense of this spelling is "thrifty" (1780). Related: Economically.[economical etymology, economical origin, 英语词源]