I'm wondering if there is a shortcut term for "one-and-a-half weeks", perhaps a word like "sesquiennial" (one-and-a-half years).

Is there such a word? Sesqui-weekly? It sounds funny and wrong. Are there sesqui- terms for other date ranges?

  • Since a week is either 7 calendar days or 5 work days, how do you deal with the fractions?
    – John Feltz
    Commented Nov 22, 2016 at 17:06
  • 1
    What constitutes as a "week and a half"? 10 or 11 days?
    – Hank
    Commented Nov 22, 2016 at 17:26
  • 2
    I think the constructed word might be along the lines of sesquihebdomedarian, but no one will ever use it.
    – Adam
    Commented Aug 8, 2017 at 15:12

1 Answer 1


The closest I can think of is "a week and a half", slightly shorter and more relaxed than "one and...". Not too many people use the sesqui- forms for anything in ordinary writing or speech.

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