availableyoudaoicibaDictYouDict[available 词源字典]
available: see value
[available etymology, available origin, 英语词源]
available (adj.)youdaoicibaDictYouDict
mid-15c., "beneficial," also "valid, effective, capable of producing the desired effect," from avail + -able. Meaning "at one's disposal, capable of being made use of" is recorded from 1827.