## Etymology
From Old English seofon nihta ('seven nights'), an old reckoning of time by nights rather than days; contracted to sennight and now largely archaic, paralleling fortnight.

## AI Etymology
Sevennight comes from Old English seofon nihta ('seven nights'), an old reckoning of time by nights rather than days; contracted to sennight and now largely archaic, paralleling fortnight. The historical chain includes Old English seofon niht. Older glosses in the chain include "seven nights", which help explain the semantic range of the modern word. Morphologically, sevennight is best read as borrowing, yielding an English noun shaped by both form history and later usage. In current English it functions as a noun, with the sense "a period of seven nights; a week (archaic)". related forms include sennight, fortnight, and week. The result is an English noun whose etymology preserves the older forms while supporting the word's specialized modern meaning.

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