Fortnight
来自Big Physics
Old English fēowertīene niht ‘fourteen nights’.
wiktionary
From Middle English fourtenight, fourten night, from Old English fēowertīene niht(“fourteen days”), equivalent to fourteen + night. Compare sennight.
etymonline
fortnight (n.)
"period of two weeks," 17c. contraction of Middle English fourteniht, from Old English feowertyne niht, literally "fourteen nights" (see fourteen + night). It preserves the ancient Germanic custom of reckoning by nights (mentioned by Tacitus in "Germania" xi). Related: Fortnightly.
