postage (n.)youdaoicibaDictYouDict[postage 词源字典]
1580s, "sending of mail by post;" 1650s as "cost of sending something by mail," from post (n.3) + -age. Postage stamp is attested from 1840; they were recorded as being collected in albums by 1862.[postage etymology, postage origin, 英语词源]