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sennight

noun
sen·night | \ˈse-ˌnīt \
variants: or less commonly se'nnight

Definition of sennight 

archaic

: the space of seven nights and days : week

First Known Use of sennight

15th century, in the meaning defined above

History and Etymology for sennight

Middle English, from Old English seofon nihta seven nights

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Dictionary Entries near sennight

sennegrass

sennet

Sennett's oriole

sennight

sennit

se non è vero, è ben trovato

Senonian

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The first known use of sennight was in the 15th century

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