Definition
In old English law, the eighth day inclusive after a feast day. The octave functioned as one of the recognized return days of writs — that is, a day on which writs were returnable to the court and on which judicial proceedings could formally commence or continue. The term derives from the ecclesiastical calendar, which structured the medieval English legal year around major church feast days. Because the feast day itself was counted as the first day, the "octave" fell on what would be the seventh day following in modern counting.
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Why It Matters in Research
This term is almost exclusively a historical artifact. Researchers encounter "ootave" (and its variant spellings, including "octave" and "utas") primarily in pre-modern English legal records, plea rolls, and procedural texts from the medieval and early modern periods. Understanding it is essential for correctly reading writ return dates in Year Books, Chancery records, and common law pleading documents.
Several practical traps exist for researchers working in historical sources:
First, the ecclesiastical calendar dependency means that identifying the actual calendar date corresponding to an ootave requires knowing both which feast day is referenced and how that feast fell in the year in question. A reference to "the ootave of Michaelmas" points to a specific date only after consulting the liturgical calendar.
Second, the inclusive counting convention (the feast day itself as day one) is counterintuitive to modern researchers and produces a date one day earlier than a researcher might expect if counting forward from the feast.
Third, the term appears in variant spellings across the corpus. "Utas" and "octave" are functionally synonymous in many historical sources, and Blackstone himself uses "octave" in the passage cited. Researchers searching for "ootave" alone may miss relevant documents using these alternatives.
This term connects closely to the broader system of English legal terms and return days — a system that also included the quindene (the fifteenth day after a feast) and other feast-anchored procedural markers that governed when courts sat and when writs had to be answered.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed., Supplemental) defines ootave as "[i]n old English law. The eighth day inclusive after a feast; one of the return days of writs," citing Blackstone's Commentaries, volume 3 at page 278.
The entry is brief but accurate. Blackstone's treatment in Book III remains the most accessible primary source for understanding the system of English return days as a whole, situating the ootave within a calendar of legally significant days derived from the church calendar. Historical dictionaries do not meaningfully diverge on this term — it is narrow, technical, and stable in meaning. What the historical sources largely omit is any practical guidance for converting ootave references to Gregorian calendar dates, a task that requires supplementary reference to historical ecclesiastical calendars and feast day tables.
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Jurisdictional Note
This term is specific to the historical English common law system and has no operative legal meaning in any modern jurisdiction. It is a research term, not a term of current law.
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