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sennight

[sen-ahyt, -it] /ˈsɛn aɪt, -ɪt/
noun, Archaic.
1.
a week.
Also, se'nnight.
Origin
1000
before 1000; Middle English sevenyht, seoveniht(e), sennyght, etc., Old English seofon nihta. See seven, night
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sennight

sennight

/ˈsɛnaɪt/
noun
1.
an archaic word for week
Word Origin
Old English seofan nihte; see seven, night
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for sennight
n.

"period of seven days, a week" (archaic), c.1200, contracted from Old English seofon nihta; see seven + night. Also cf. fortnight.

Online Etymology Dictionary, © 2010 Douglas Harper
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