sen·night
| \ ˈse-ˌnīt
\
\
variants:
or less commonly se'nnight
Definition of sennight
archaic
: the space of seven nights and days : week
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“Sennight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sennight. Accessed 19 May. 2022.
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The first known use of sennight was in the 15th century
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