acting (adj.)youdaoicibaDictYouDict[acting 词源字典]
1590s, "putting forth activity," present participle adjective from act (v.). Meaning "performing temporary duties" is from 1797.[acting etymology, acting origin, 英语词源]
acting (n.)youdaoicibaDictYouDict
c. 1600, "performance of deeds;" 1660s, "performance of plays;" verbal noun from present participle of act (v.). Acting out in psychology is from 1945.