admittance (n.)youdaoicibaDictYouDict[admittance 词源字典]
1580s, "the action of admitting," formed in English from admit + -ance (if from Latin, it would have been *admittence; French uses accès in this sense). Used formerly in senses where admission now prevails. Admissure was used in this sense from mid-15c.[admittance etymology, admittance origin, 英语词源]