Seventh
来自Big Physics
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Old English seofon, of Germanic origin; related to Dutch zeven and German sieben, from an Indo-European root shared by Latin septem and Greek hepta .
wiktionary
From Middle English sevenþe, sefte, from Old English seofoþa, from Proto-Germanic *sebundô.
etymonline
seventh (adj., n.)
"next in order after the sixth; an ordinal numeral; being one of seven equal parts into which a whole is regarded as divided;" c. 1300, from seven + -th (1), replacing earlier sevende, seveth, from Old English seofunda (Anglian, Northumbrian), seofoþa (West Saxon), from Proto-Germanic *sebundon (source also of Old Norse sjaundi, Old Saxon sivondo, Old High German sibunto, German siebente, siebte). The music note sense is from 1590s.
