ratable (adj.)youdaoicibaDictYouDict[ratable 词源字典]
also rateable, c. 1500, from rate (v.2) + -able.[ratable etymology, ratable origin, 英语词源]
ratalyoudaoicibaDictYouDict
"Relating to rates or rateable value", Mid 19th cent.; earliest use found in The Times. From rate + -al. In use as noun perhaps after rental.